Dynamically generate a heading for Extension Docs API pages

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

-<h2 id="manifest">Notes</h2>
-
-<p>
-The top sites module allows access to the top sites that are displayed on
-the new tab page.
-</p>
-
 <h2 id="manifest">Manifest</h2>
 
 <p>
 You must declare the "topSites" permission in your extension's manifest
 to use this API.
 </p>
 
 <pre>{
   "name": "My extension",
   ...
 <b>  "permissions": [
     "topSites",
   ]</b>,
   ...
 }</pre>
 
 
 <h2 id="examples">Examples</h2>
 
 <p>
 You can find samples of this API in
 <a href="samples.html#topsites">Samples</a>.
-</p>
+</p>