Change Semantic header to Semantic/Metadata

Author: CrazyPython

index.html

@@ -353,7 +353,7 @@ <h3>Key</h3>
             </tr>
             </tr>
             <tr>
-                <th>Semantic</th>
+                <th>Semantic &amp; Metadata</th>
                 <td class="all">
                     <time>1999</time>
                     <dt>Hd</dt>