Fix demo id, should be on option for activedescendant

Author: muan

examples/index.html

@@ -18,7 +18,7 @@
       <li id="bb-8" role="option" aria-disabled="true"><del>BB-8</del></li>
       <li id="hubot" role="option">Hubot</li>
       <li id="r2-d2" role="option">R2-D2</li>
-      <li id="wall-e"><a href="#wall-e" role="option">Wall-E</a></li>
+      <li><a id="wall-e" href="#wall-e" role="option">Wall-E</a></li>
     </ul>
   </form>
   <pre class="events"></pre>