Update html-aam/index.html

Co-authored-by: James Craig <[email protected]>

html-aam/index.html

@@ -9254,7 +9254,7 @@ <h4 id="att-command-popovers">`command` <span class="att-context">(in the Toggle
               <th>Comments</th>
               <td>
                 <p>
-                  User Agents MUST expose an <a class="core-mapping" href="#ariaDetails">`aria-details`</a> relation with the associated element (identified via the specified `commandfor` attribute) <strong>except</strong> under the following conditions:
+                  User Agents MUST expose an <a class="core-mapping" href="#ariaDetails">`aria-details`</a> relationship with the associated element (identified via the specified `commandfor` attribute) <strong>except</strong> under the following conditions:
                 </p>
                 <ul>
                   <li>The associated popover element is the next immediate accessibility sibling to the invoking element,</li>