Fixing path to chrome app samples in documentation

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

 <meta name="doc-family" content="apps">
 <h1 id="gcm">Google Cloud Messaging</h1>
 
 <p>Google Cloud Messaging (GCM) is a service for both Android-powered device and
 Chrome instances to send and receive message data from servers.
 The <a href="gcm">chrome.gcm API</a> allows the Chrome apps or extensions
 to access the GCM service for the signed-in Chrome users.
 The service works even if an app or extension isn't currently running.
 For example, calendar updates could be pushed
 to users even when their calendar app isn't open. </p>
 
 <p>To use both API and service, you must agree to the <a href="https://developers.google.com/terms/">Google APIs Terms of
 Service</a> and <a href="https://developers.google.com/cloud/terms/">Google Cloud Platform Terms
 of Service</a>.</p>
 
 <p>This document describes how to set up and use GCM. For additional information
 see the reference documentation for the <a href="gcm">GCM Chrome API</a> and
 the <a href="http://developer.android.com/google/gcm/index.html">GCM Service</a>. To get
 help with GCM or to give us feedback, please see
 <a href="#feedback">Feedback</a>.</p>
 
 <p class="note"><strong>API Samples</strong>: Want to play with the code? Check out the
-<a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/gcm-notifications">gcm-notifications</a>
+<a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/samples/gcm-notifications">gcm-notifications</a>
 sample.</p>
 
 <h2 id="enable_gcm">Enable GCM</h2>
 
 <p>To use GCM for your app or extension, do the following:</p>
 
 <ol>
 <li>Upload your app or extension client to the <a href="https://developers.google.com/chrome/web-store/docs/publish">Chrome Web
 Store</a>.</li>
 <li>A user installs your app or extension.</li>
@@ skipping 340 matching lines @@
 errors.</li>
 </ul>
 
 <h2 id="feedback">Feedback</h2>
 
 <p>You can provide feedback about Google Cloud Messaging and the
 <a href="gcm">chrome.gcm API</a> through
 the Google Group <a href="https://groups.google.com/forum/#!forum/gcm-for-chrome-feedback">GCM for Chrome
 Feedback</a>.
 Use this group to ask for help, file bug reports, and request features.</p>