Add missing space for img role "wai-aria" mapping (#542)

Co-authored-by: Rahim Abdi <[email protected]>

Author: rahimabdi

index.html

@@ -3216,7 +3216,7 @@ <h4 id=el-img>`img`</h4>
       <th>[[wai-aria-1.2]]</th>
       <td>
         <a class="core-mapping" href="#role-map-image">`image`</a>
-        or  <a class="core-mapping" href="#role-map-img">`img`</a>role
+        or  <a class="core-mapping" href="#role-map-img">`img`</a> role
       </td>
     </tr>
     <tr>