docs(configuration): sort performance options (webpack#5295)

* docs: move performance.assetFilters

* docs(configuration): move performance.maxAssetSize

* docs(configuration): fix heading levels for performance

src/content/configuration/performance.mdx

@@ -18,7 +18,34 @@ This feature was inspired by the idea of [webpack Performance Budgets](https://g
 
 Configure how performance hints are shown. For example if you have an asset that is over 250kb, webpack will emit a warning notifying you of this.
 
-## `performance.hints`
+### performance.assetFilter
+
+`function(assetFilename) => boolean`
+
+This property allows webpack to control what files are used to calculate performance hints. The default function is:
+
+```js
+function assetFilter(assetFilename) {
+  return !/\.map$/.test(assetFilename);
+}
+```
+
+You can override this property by passing your own function in:
+
+```js
+module.exports = {
+  //...
+  performance: {
+    assetFilter: function (assetFilename) {
+      return assetFilename.endsWith('.js');
+    },
+  },
+};
+```
+
+The example above will only give you performance hints based on `.js` files.
+
+### performance.hints
 
 `string = 'warning': 'error' | 'warning'` `boolean: false`
 
@@ -59,22 +86,7 @@ module.exports = {
 
 An error will be displayed notifying you of a large asset. We recommend using `hints: "error"` during production builds to help prevent deploying production bundles that are too large, impacting webpage performance.
 
-## `performance.maxEntrypointSize`
-
-`number = 250000`
-
-An entry point represents all assets that would be utilized during initial load time for a specific entry. This option controls when webpack should emit performance hints based on the maximum entry point size in bytes.
-
-```js
-module.exports = {
-  //...
-  performance: {
-    maxEntrypointSize: 400000,
-  },
-};
-```
-
-## `performance.maxAssetSize`
+### performance.maxAssetSize
 
 `number = 250000`
 
@@ -89,29 +101,17 @@ module.exports = {
 };
 ```
 
-## `performance.assetFilter`
-
-`function(assetFilename) => boolean`
-
-This property allows webpack to control what files are used to calculate performance hints. The default function is:
+### performance.maxEntrypointSize
 
-```js
-function assetFilter(assetFilename) {
-  return !/\.map$/.test(assetFilename);
-}
-```
+`number = 250000`
 
-You can override this property by passing your own function in:
+An entry point represents all assets that would be utilized during initial load time for a specific entry. This option controls when webpack should emit performance hints based on the maximum entry point size in bytes.
 
 ```js
 module.exports = {
   //...
   performance: {
-    assetFilter: function (assetFilename) {
-      return assetFilename.endsWith('.js');
-    },
+    maxEntrypointSize: 400000,
   },
 };
 ```
-
-The example above will only give you performance hints based on `.js` files.