Updated docs to link to Stack Overflow as a support channel.

chrome/common/extensions/docs/template/api_template.html

   <div id="gc-container" class="labs">
       <div id="devModeWarning">
         You are viewing extension docs in chrome via the 'file:' scheme: are you expecting to see local changes when you refresh? You'll need run chrome with --allow-file-access-from-files.
       </div>
       <!-- SUBTEMPLATES: DO NOT MOVE FROM THIS LOCATION -->
       <!-- In particular, sub-templates that recurse, must be used by allowing
            jstemplate to make a copy of the template in this section which
            are not operated on by way of the jsskip="true" -->
       <div jsskip="true" style="display:none">
 
@@ skipping 182 matching lines @@
           </li>
           <li id="faq_link">
             <a href="faq.html" title="Answers to frequently asked questions about Google Chrome Extensions">FAQ</a>
           </li>
           <li id="samples_link">
             <a href="samples.html" title="Sample extensions (with source code)">Samples</a>
           </li>
           <li id="group_link">
             <a href="http://groups.google.com/a/chromium.org/group/chromium-extensions" title="Google Chrome Extensions developer forum">Group</a>
           </li>
+          <li id="so_link">
+            <a href="http://stackoverflow.com/questions/tagged/google-chrome-extension" title="[google-chrome-extension] tag on Stack Overflow">Questions?</a>
+          </li>
         </ul>
       </div> <!-- end gc-topnav -->
 
     <div class="g-section g-tpl-170">
       <!-- SIDENAV -->
       <div class="g-unit g-first" id="gc-toc" jsdisplay="showSideNav()">
         <ul>
           <li><a href="getstarted.html">Getting Started</a></li>
           <li><a href="overview.html">Overview</a></li>
           <li><a href="whats_new.html">What's New?</a></li>
@@ skipping 327 matching lines @@
     _uanchor=1;
     _uff=0;
     urchinTracker();
   }
   catch(e) {/* urchinTracker not available. */}
 </script>
 <!-- end analytics -->
       </div>
     </div> <!-- /gc-footer -->
   </div> <!-- /gc-container -->