Extensions Docs Server: Fix headings with no IDs

chrome/common/extensions/docs/templates/articles/first_app.html

 <meta name="doc-family" content="apps">
 <h1>Create Your First App</h1>
 
 
 <p>
 This tutorial walks you through creating your first packaged app.
 Packaged apps are structured similarly to extensions
 so current developers will recognize the manifest and packaging methods.
 When you're done,
 you'll just need to produce a zip file of your code and assets
@@ skipping 100 matching lines @@
 Copy these icons to your app folder:
 </p>
 
 <ul>
   <li><a href="{{static}}/images/calculator-16.png">calculator-16.png</a></li>
   <li><a href="{{static}}/images/calculator-128.png">calculator-128.png</a></li>
 </ul>
 
 <h2 id="five">Step 5: Launch your app</h2>
 
-<h3>Enable flags</h3>
+<h3 id="enable">Enable flags</h3>
 
 <p>
 Many of the packaged apps APIs are still experimental,
 so you should enable experimental APIs
 so that you can try them out:
 </p>
 
 <ul>
   <li>Go to <b>chrome://flags</b>.</li>
   <li>Find "Experimental Extension APIs",
     and click its "Enable" link.</li>
   <li>Restart Chrome.</li>
 </ul>
 
-<h3>Load your app</h3>
+<h3 id="load">Load your app</h3>
 
 <p>
 To load your app,
 bring up the apps and extensions management page
 by clicking the wrench icon
 <img src="{{static}}/images/toolsmenu.gif" width="29" height="29" alt=""
         style="margin-top:0" />
 and choosing <b>Tools > Extensions</b>.
 </p>
 
 <p>
 Make sure the <b>Developer mode</b>
 checkbox has been selected.
 </p>
 
 <p>
 Click the <b>Load unpacked extension</b> button,
 navigate to your app's folder
 and click <b>OK</b>.
 </p>
 
-<h3>Open new tab and launch</h3>
+<h3 id="open">Open new tab and launch</h3>
 
 <p>
 Once you've loaded your app,
 open a New Tab page
 and click on your new app icon.
 </p>
 
 <p class="backtotop"><a href="#top">Back to top</a></p>