[DocServer] Fixed Sample Links

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

 <h1>Overview</h1>
 
 
 <p>
 Once you've finished this page
 and the
 <a href="getstarted.html">Getting Started</a> tutorial,
 you'll be all set to start writing extensions.
 </p>
 
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   </td>
   <td>
     <img src="{{static}}/images/overview/browser-action-with-popup.png"
       width="147" height="100"
       alt="screenshot" />
   </td>
 </tr>
 
 <tr>
   <td>
-    This <a href="samples.html#gmail">mail extension</a>
+    This <a href="samples.html#google-mail-checker">Google Mail Checker extension</a>
     uses a <em>browser action</em>
     (icon in the toolbar).
   </td>
   <td>
-    This <a href="samples.html#mappy">map extension</a>
+    This <a href="samples.html#mappy">Mappy extension</a>
     uses a <em>page action</em>
     (icon in the address bar)
     and <em>content script</em>
     (code injected into a web page).
   </td>
   <td>
-    This <a href="samples.html#news">news extension</a>
+    This <a href="samples.html#news-reader">News Reader extension</a>
     features a browser action that,
     when clicked,
     shows a <em>popup</em>.
   </td>
 </tr>
 </table>
 
 <p>
 Extensions (and packaged apps) can also present a UI in other ways,
 such as adding to the Chrome context menu,
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 <ul>
   <li> <a href="getstarted.html">Tutorial: Getting Started</a> </li>
   <li> <a href="tut_debugging.html">Tutorial: Debugging</a> </li>
   <li> <a href="devguide.html">Developer's Guide</a> </li>
   <li> <a href="samples.html">Samples</a> </li>
   <li> <a href="http://www.youtube.com/view_play_list?p=CA101D6A85FE9D4B">Videos</a>,
     such as
     <a href="http://www.youtube.com/watch?v=B4M_a7xejYI&feature=PlayList&p=CA101D6A85FE9D4B&index=6">Extension Message Passing</a>
     </li>
 </ul>