fix: restore Menu#anchorEl documentation

docs/pages/api-docs/menu.md

@@ -24,6 +24,7 @@ You can learn more about the difference by [reading this guide](/guides/minimizi
 
 | Name | Type | Default | Description |
 |:-----|:-----|:--------|:------------|
+| <span class="prop-name">anchorEl</span> | <span class="prop-type">func<br>&#124;&nbsp;Element</span> |  | The DOM element used to set the position of the menu. |
 | <span class="prop-name">autoFocus</span> | <span class="prop-type">bool</span> | <span class="prop-default">true</span> | If `true` (Default) will focus the `[role="menu"]` if no focusable child is found. Disabled children are not focusable. If you set this prop to `false` focus will be placed on the parent modal container. This has severe accessibility implications and should only be considered if you manage focus otherwise. |
 | <span class="prop-name">children</span> | <span class="prop-type">node</span> |  | Menu contents, normally `MenuItem`s. |
 | <span class="prop-name">classes</span> | <span class="prop-type">object</span> |  | Override or extend the styles applied to the component. See [CSS API](#css) below for more details. |

packages/material-ui/src/Menu/Menu.d.ts

@@ -9,6 +9,7 @@ export interface MenuProps
   extends StandardProps<PopoverProps & Partial<TransitionHandlerProps>, MenuClassKey> {
   /**
    * The DOM element used to set the position of the menu.
+   * @document
    */
   anchorEl?: PopoverProps['anchorEl'];
   /**

packages/material-ui/src/Menu/Menu.js

@@ -170,6 +170,13 @@ Menu.propTypes = {
   // | These PropTypes are generated from the TypeScript type definitions |
   // |     To update them edit the d.ts file and run "yarn proptypes"     |
   // ----------------------------------------------------------------------
+  /**
+   * The DOM element used to set the position of the menu.
+   */
+  anchorEl: PropTypes.oneOfType([
+    PropTypes.func,
+    PropTypes.instanceOf(typeof Element === 'undefined' ? Object : Element),
+  ]),
   /**
    * If `true` (Default) will focus the `[role="menu"]` if no focusable child is found. Disabled
    * children are not focusable. If you set this prop to `false` focus will be placed