docs: Fix some broken links to samples where the #hash-word is supposed to be a search term.

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

 <h2 id="manifest">Manifest</h2>
 
 <p>
 You must declare the "topSites" permission in your extension's manifest
 to use this API.
 </p>
 
 <pre data-filename="manifest.json">
 {
   "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#topsites">Samples</a>.
+<a href="samples#search:topsites">Samples</a>.
 </p>