Specify that non-matching media type responses should be rejected.

Author: msporny

index.html

@@ -3209,7 +3209,8 @@ <h2>Integrity of Related Resources</h2>
 use the media type in the `Accept` HTTP Header, and
           </li>
           <li>
-use the media type in the `Content-Type` HTTP Header.
+reject the response if it includes a `Content-Type` HTTP Header with a different
+media type.
           </li>
         </ul>