Update docs/en/UI/AspNetCore/Navigation-Menu.md

Co-authored-by: Qingxiao Ren <rqx110@163.com>

docs/en/UI/AspNetCore/Navigation-Menu.md

@@ -100,7 +100,7 @@ There are more options of a menu item (the constructor of the `ApplicationMenuIt
 * `url` (`string`): The URL of the menu item.
 * `icon` (`string`): An icon name. Free [Font Awesome](https://fontawesome.com/) icon classes are supported out of the box. Example: `fa fa-book`. You can use any CSS font icon class as long as you include the necessary CSS files to your application.
 * `order` (`int`): The order of the menu item. Default value is `1000`. Items are sorted by the adding order unless you specify an order value.
-* `customData` (`Dictionary<object, string>`): A dictionary that allows storing custom objects that you can associate with the menu item and use it while rendering the menu item.
+* `customData` (`Dictionary<string, object>`): A dictionary that allows storing custom objects that you can associate with the menu item and use it while rendering the menu item.
 * `target` (`string`): Target of the menu item. Can be `null` (default), "\_*blank*", "\_*self*", "\_*parent*", "\_*top*" or a frame name for web applications.
 * `elementId` (`string`): Can be used to render the element with a specific HTML `id` attribute.
 * `cssClass` (`string`): Additional string classes for the menu item.