Update role-required-states-and-properties-4e8ab6.md (#2263)

Author: giacomo-petri

_rules/role-required-states-and-properties-4e8ab6.md

@@ -119,9 +119,9 @@ This `separator` is not a `widget` because it is not [focusable][]. The `separat
 This `combobox` has the required properties `aria-controls` and `aria-expanded`.
 
 ```html
-<label for="tag_combo">Tag</label>
-<input type="text" id="tag_combo" role="combobox" aria-expanded="true" aria-controls="popup_listbox" />
-<ul role="listbox" id="popup_listbox">
+<label for="tag_combo" id="tag_label">Tag</label>
+<input type="text" id="tag_combo" role="combobox" aria-expanded="true" aria-controls="popup_listbox"/>
+<ul role="listbox" id="popup_listbox" aria-labelledby="tag_label">
 	<li role="option">Zebra</li>
 	<li role="option" id="selected_option">Zoom</li>
 </ul>