Use thead/tbody style for manual table

docs/deprecation-policy.md

@@ -83,11 +83,14 @@ approximately 3 months (4 per year).  The following table describes which API
 versions are supported in a series of subsequent releases.
 
 <table>
+  <thead>
     <tr>
       <th>Release</th>
       <th>API Versions</th>
       <th>Notes</th>
     </tr>
+  </thead>
+  <tbody>
     <tr>
       <td>X</td>
       <td>v1</td>
@@ -164,6 +167,7 @@ versions are supported in a series of subsequent releases.
         </ul>
       </td>
     </tr>
+  </tbody>
 </table>
 
 ### REST resources (aka API objects)