Extensions Docs Server: Fix headings with no IDs

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

 <p>Use browser actions to put icons
   in the main Google Chrome toolbar,
   to the right of the address bar.
   In addition to its <a href="#icon">icon</a>,
   a browser action can also have
   a <a href="#tooltip">tooltip</a>,
   a <a href="#badge">badge</a>,
   and a <a href="#popups">popup</a>.
   </p>
 
@@ skipping 144 matching lines @@
   </p>
 
 <p>
 To add a popup to your browser action,
 create an HTML file with the popup's contents.
 Specify the HTML file in the <b>default_popup</b> field of <b>browser_action</b>
 in the <a href="#manifest">manifest</a>, or call the
 <a href="#method-setPopup">setPopup()</a> method.
 </p>
 
-<h2>Tips</h2>
+<h2 id="tips">Tips</h2>
 
 <p>For the best visual impact,
   follow these guidelines:</p>
 
 <ul>
   <li><b>Do</b> use browser actions for features
     that make sense on most pages.
   <li><b>Don't</b> use browser actions for features
     that make sense for only a few pages.
     Use <a href="pageAction.html">page actions</a> instead.
@@ skipping 16 matching lines @@
 
 <h2 id="examples"> Examples </h2>
 
 <p>
 You can find simple examples of using browser actions in the
 <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/api/browserAction/">examples/api/browserAction</a>
 directory.
 For other examples and for help in viewing the source code, see
 <a href="samples.html">Samples</a>.
 </p>