Fix dispositions of contentProfiles and represents

Addresses @andreastai review feedback

Author: nigelmegitt

index.html

@@ -3211,7 +3211,7 @@ <h4>Disposition of Features and Extensions</h4>
           </tr>
           <tr>
             <td> <dfn data-cite="TTML2#feature-contentProfiles"><code>#contentProfiles</code></dfn></td>
-            <td><span class="optional label">optional</span></td>
+            <td><span class="permitted label">permitted</span></td>
             <td>See <a href="#ttp-contentprofiles"></a>
               and <a href="#extension-contentProfiles-root"></a>.</td>
           </tr>
@@ -3571,7 +3571,7 @@ <h4>Disposition of Features and Extensions</h4>
           </tr>
           <tr>
             <td><a href="#extension-represents"><code>#represents</code></a></td>
-            <td><span class="permitted label">permitted</span></td>
+            <td><span class="required label">required</span></td>
             <td>
               This is the profile expression of <a>Represents</a>
               as applied to <a>Script Event</a>.