record change in the changelog appendix

Author: pchampin

index.html

@@ -7117,6 +7117,7 @@ <h2>Changes since Recommendation of 16 July 2020</h2>
       was to remove <q>and return</q> from the end of step 13, and revise step
       14 to begin with <q>Otherwise</q>.</li>
     <li>Use <a>code point order</a> as a better definition for the more vague "lexicographical order".</li>
+    <li>Remove spurious paragraph in the description of {{JsonLdOptions/frameExpansion}}</li>
   </ul>
 </section>
 <section id="ack"