Editorial: remove erroneous li (#2471)

Closes #2463

Author: keithamus

index.html

@@ -11410,9 +11410,7 @@ <h5>Presentational Role Inheritance</h5>
               </tr>
               <tr>
                 <th class="role-mustcontain-head" scope="row">Allowed Accessibility Child Roles:</th>
-                <td class="role-mustcontain">
-                  <li><rref>treeitem</rref></li>
-                </td>
+                <td class="role-mustcontain"><rref>treeitem</rref></td>
               </tr>
               <tr>
                 <th class="role-required-properties-head">Required States and Properties:</th>