Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/docs/templates/intros/commands.html

 <table class="intro">
   <tr>
     <th scope="col"></th>
     <th scope="col"></th>
   </tr>
   <tr>
-    <td><strong>Description:</strong></td>
-    <td>Use the commands API to add keyboard shortcuts
-    that trigger actions in your extension,
-    for example, an action to open the browser action
-    or send a command to the extension.</td>
-  </tr>
-  <tr>
-    <td><strong>Availability:</strong></td>
-    <td>Google Chrome 25</td>
-  </tr>
-  <tr>
     <td><strong>Permissions:</strong></td>
     <td>None</td>
   </tr>
 </table>
 
 <h2 id="manifest">Manifest</h2>
 <p>
 You must set manifest_version to (at least) 2 to use this API.
 </p>
 
@@ skipping 48 matching lines @@
   console.log('Command:', command);
 });
 </pre>
 
 <p>The '_execute_browser_action' and '_execute_page_action' commands are
 reserved for the action of opening your extension's popups. They won't normally
 generate events that you can handle. If you need to take action based on your
 popup opening, consider listening for an 'onDomReady' event inside your popup's
 code.
 </p>