Convert reserved term URLs into normative statements.

Author: msporny

index.html

@@ -3209,22 +3209,23 @@ <h3>Reserved Extension Points</h3>
               <td>`evidence`</td>
               <td>
 A property used for specifying the evidence that was presented in order to
-issue the credential.<br>
-Vocabulary URL: `https://www.w3.org/2018/credentials#evidence`
+issue the credential. The associated vocabulary URL MUST be
+`https://www.w3.org/2018/credentials#evidence`.
               </td>
             </tr>
             <tr>
               <td>`refreshService`</td>
               <td>
-A property used for specifying how a credential can be refreshed.<br>
-Vocabulary URL: `https://www.w3.org/2018/credentials#refreshService`
+A property used for specifying how a credential can be refreshed. The
+associated vocabulary URL MUST be
+`https://www.w3.org/2018/credentials#refreshService`.
               </td>
             </tr>
             <tr>
               <td>`termsOfUse`</td>
               <td>
-A property used for specifying the terms of use for a credential.<br>
-Vocabulary URL: `https://www.w3.org/2018/credentials#termsOfUse`
+A property used for specifying the terms of use for a credential. The associated
+vocabulary URL MUST be `https://www.w3.org/2018/credentials#termsOfUse`.
               </td>
             </tr>
           </tbody>