Fixed doc [skip ci]

framework/widgets/Menu.php

@@ -72,8 +72,9 @@ class Menu extends Widget
      */
     public $items = [];
     /**
-     * @var array list of HTML attributes for the menu container tag. This will be overwritten
-     * by the "options" set in individual [[items]]. The following special options are recognized:
+     * @var array list of HTML attributes shared by all menu [[items]]. If any individual menu item
+     * specifies its `options`, it will be merged with this property before being used to generate the HTML
+     * attributes for the menu item tag. The following special options are recognized:
      *
      * - tag: string, defaults to "li", the tag name of the item container tags.
      *