Add documents for suppressBooleanAttributes

docs/v4/3.XMLBuilder.md

@@ -84,6 +84,39 @@ As you set `stopNodes` to the XML parser configuration to avoid parsing and proc
 
 This property is currently supported with `preserveOrder: true` option only.
 
+## suppressBooleanAttributes
+You can parse attributes with value `true` without their value.
+
+Input
+```js
+const jsOrderedObj = [
+    {
+        "?textinfo": [
+            {
+                "#text": ""
+            }
+        ],
+        ":@": {
+            "@_whitespace": true,
+            "@_is": true,
+            "@_allowed": true
+        }
+    }
+];
+const options = {
+    ignoreAttributes: false,
+    preserveOrder: true,
+    allowBooleanAttributes: true,
+    suppressBooleanAttributes: true
+};
+const builder = new XMLBuilder(options);
+const output = builder.build(result);
+```
+Outout
+```xml
+<?textinfo   whitespace is allowed?>
+```
+
 ## suppressEmptyNode
 Tags with no text value would be parsed as empty tags.
 Input

docs/v4/7.PITags.md

@@ -70,7 +70,8 @@ When you setup builder to parse the above JS ordered object
 const options = {
     ignoreAttributes: false,
     preserveOrder: true,
-    allowBooleanAttributes: true
+    allowBooleanAttributes: true,
+    suppressBooleanAttributes: true
 };
 const builder = new XMLBuilder(options);
 const output = builder.build(result);