feat(content): update the api

#### content:v21

The following keys were added:
- resources.products.methods.update (Total Keys: 18)
- schemas.OrderreturnsLineItem.properties.productId.type (Total Keys: 1)
- schemas.ProductsCustomBatchRequestEntry.properties.updateMask (Total Keys: 2)

docs/dyn/content_v2.products.html

@@ -115,7 +115,7 @@ <h3>Method Details</h3>
       &quot;batchId&quot;: 42, # An entry ID, unique within the batch request.
       &quot;merchantId&quot;: &quot;A String&quot;, # The ID of the managing account.
       &quot;method&quot;: &quot;A String&quot;, # The method of the batch entry. Acceptable values are: - &quot;`delete`&quot; - &quot;`get`&quot; - &quot;`insert`&quot;
-      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # The product to insert. Only required if the method is `insert`.
+      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # The product to insert. Only required if the method is `insert`.
         &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
           &quot;A String&quot;,
         ],
@@ -335,7 +335,7 @@ <h3>Method Details</h3>
         &quot;message&quot;: &quot;A String&quot;, # The message of the first error in `errors`.
       },
       &quot;kind&quot;: &quot;A String&quot;, # Identifies what kind of resource this is. Value: the fixed string &quot;`content#productsCustomBatchResponseEntry`&quot;
-      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # The inserted product. Only defined if the method is `insert` and if the request was successful.
+      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # The inserted product. Only defined if the method is `insert` and if the request was successful.
         &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
           &quot;A String&quot;,
         ],
@@ -561,7 +561,7 @@ <h3>Method Details</h3>
 Returns:
   An object of the form:
 
-    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
+    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
   &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
     &quot;A String&quot;,
   ],
@@ -762,7 +762,7 @@ <h3>Method Details</h3>
   body: object, The request body.
     The object takes the form of:
 
-{ #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
+{ #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
   &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
     &quot;A String&quot;,
   ],
@@ -962,7 +962,7 @@ <h3>Method Details</h3>
 Returns:
   An object of the form:
 
-    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
+    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
   &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
     &quot;A String&quot;,
   ],
@@ -1175,7 +1175,7 @@ <h3>Method Details</h3>
   &quot;kind&quot;: &quot;A String&quot;, # Identifies what kind of resource this is. Value: the fixed string &quot;content#productsListResponse&quot;.
   &quot;nextPageToken&quot;: &quot;A String&quot;, # The token for the retrieval of the next page of products.
   &quot;resources&quot;: [
-    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
+    { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.
       &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
         &quot;A String&quot;,
       ],

docs/dyn/content_v2.productstatuses.html

@@ -182,7 +182,7 @@ <h3>Method Details</h3>
         &quot;kind&quot;: &quot;A String&quot;, # Identifies what kind of resource this is. Value: the fixed string &quot;`content#productStatus`&quot;
         &quot;lastUpdateDate&quot;: &quot;A String&quot;, # Date on which the item has been last updated, in ISO 8601 format.
         &quot;link&quot;: &quot;A String&quot;, # The link to the product.
-        &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
+        &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
           &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
             &quot;A String&quot;,
           ],
@@ -437,7 +437,7 @@ <h3>Method Details</h3>
   &quot;kind&quot;: &quot;A String&quot;, # Identifies what kind of resource this is. Value: the fixed string &quot;`content#productStatus`&quot;
   &quot;lastUpdateDate&quot;: &quot;A String&quot;, # Date on which the item has been last updated, in ISO 8601 format.
   &quot;link&quot;: &quot;A String&quot;, # The link to the product.
-  &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
+  &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
     &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
       &quot;A String&quot;,
     ],
@@ -694,7 +694,7 @@ <h3>Method Details</h3>
       &quot;kind&quot;: &quot;A String&quot;, # Identifies what kind of resource this is. Value: the fixed string &quot;`content#productStatus`&quot;
       &quot;lastUpdateDate&quot;: &quot;A String&quot;, # Date on which the item has been last updated, in ISO 8601 format.
       &quot;link&quot;: &quot;A String&quot;, # The link to the product.
-      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
+      &quot;product&quot;: { #  Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect. # Product data after applying all the join inputs.
         &quot;additionalImageLinks&quot;: [ # Additional URLs of images of the item.
           &quot;A String&quot;,
         ],

googleapiclient/discovery_cache/documents/content.v2.json

@@ -3298,7 +3298,7 @@
       }
     }
   },
-  "revision": "20210505",
+  "revision": "20210514",
   "rootUrl": "https://shoppingcontent.googleapis.com/",
   "schemas": {
     "Account": {
@@ -8554,7 +8554,7 @@
       "type": "object"
     },
     "Product": {
-      "description": " Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Some attributes are country-specific, so make sure you select the appropriate country in the drop-down selector at the top of the page. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.",
+      "description": " Required product attributes are primarily defined by the products data specification. See the Products Data Specification Help Center article for information. Product data. After inserting, updating, or deleting a product, it may take several minutes before changes take effect.",
       "id": "Product",
       "properties": {
         "additionalImageLinks": {