Renumber requirements under User Need 14 for consistency with the rest

of the document. Use ABBR markup. Correct an unrelated markup validity
error.

index.html

@@ -188,10 +188,10 @@ <h3>Presenting Differences Between Revisions</h3>
         <h3>Summarizations</h3>
         <ul>
           <li><strong>User Need 14:</strong> Users with learning or cognitive disabilities, and users of assistive technologies sometimes need support in identifying revisions and understanding their effects.</li>
-          <li><strong>REQ 14:</strong> Provide a mechanism to identify and summarize a series of changes to content. When A-I is used to generate summations, provide the ability to edit the generated summation</li>
-          <li><strong>REQ 14A:</strong> Provide a mechanism to identify and summarize individual comment threads. When A-I is used to generate summations, provide the ability to edit the generated summation</li>
-          <li><strong>REQ 14b:</strong> Provide a mechanism allowing any
-user to generate a summation for themselves on content or on a comment thread at any time. Project editors should have the ability to commit a summary to the document in collaborative development as a permanent feature of the collaborative effort.<</li>
+          <li><strong>REQ 14A:</strong> Provide a mechanism to identify and summarize a series of changes to content. When artificial intelligence (<abbr title="artificial intelligence">AI</abbr>) is used to generate summations, provide the ability to edit the generated summation</li>
+          <li><strong>REQ 14B:</strong> Provide a mechanism to identify and summarize individual comment threads. When <abbr title="artificial intelligence">AI</abbr> is used to generate summations, provide the ability to edit the generated summation</li>
+          <li><strong>REQ 14C:</strong> Provide a mechanism allowing any
+user to generate a summation for themselves on content or on a comment thread at any time. Project editors should have the ability to commit a summary to the document in collaborative development as a permanent feature of the collaborative effort.</li>
         </ul>
       </section>
     </section>