Fix out of date implicit role

Closes  #496

Author: scottaohara

index.html

@@ -1477,7 +1477,7 @@ <h2 id="docconformance">
               [^hgroup^]
             </th>
             <td>
-              <code>role=<a href="#index-aria-generic">generic</a></code>
+              <code>role=<a href="#index-aria-group">group</a></code>
             </td>
             <td>
               <p>