Fixing path to chrome app samples in documentation

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

 <h1 id="richNotifications">Rich Notifications</h1>
 
 <p>The <a href="https://developer.chrome.com/apps/notifications">rich notifications API</a>
 lets you create notifications using templates and
 show these notifications to users in the user's system tray:
 </p>
 
 <p><img src="{{static}}/images/notifications.png"
      alt="Notifications in system user tray">
 </p>
@@ skipping 50 matching lines @@
 the bell icon is lit when there's new notifications;
 On ChromeOS,
 the system tray keeps a count of all new notifications.
 Once a users sees the notifications in the system tray,
 the count is reset to zero;
 </p>
 
 <p>
 Notifications can be assigned a priority between -2 to 2.
 Priorities < 0 are only shown in the center;
-priorities > 0 are shown for increasing duration and 
+priorities > 0 are shown for increasing duration and
 more high priority notifications can be displayed in the system tray.
 </p>
 
 <p>
 In addition to displaying information,
 all notification types can include up to two action items.
 When users click on an action item,
 your app can respond with the appropriate action.
 For example,
 when the user clicks on "Reply",
@@ skipping 21 matching lines @@
 The $(ref:notifications.NotificationOptions) must include a
 $(ref:notifications.TemplateType),
 which defines available notification details
 and how those details are displayed.
 </p>
 
 <p class="note">
 <b>Consider integrating with GCM!</b><br>
 <a href="inform_users">Keep your users informed</a> all the time,
 even when your app isn't opened.
-The <a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/gcm-notifications">gcm-notifications sample</a>
-shows a simple integration between GCM and Rich Notifications API. 
+The <a href="https://github.com/GoogleChrome/chrome-app-samples/tree/master/samples/gcm-notifications">gcm-notifications sample</a>
+shows a simple integration between GCM and Rich Notifications API.
 </p>
 
 <h3 id="basic">Create basic notification</h3>
 
 <p>
 All template types
 (<code>basic</code>, <code>image</code>, <code>list</code> and <code>progress</code>)
 must include a notification <code>title</code> and <code>message</code>,
 as well as an <code>iconUrl</code>, which is a link to a small icon that
 is displayed to the left of the notification message.
@@ skipping 87 matching lines @@
 <p>Event listener:</p>
 
 <pre>
 chrome.notifications.onButtonClicked.addListener(replyBtnClick);
 </pre>
 
 <p>Event handler:</p>
 
 <pre>
 function replyBtnClick {
-        //Write function to respond to user action. 
+        //Write function to respond to user action.
 }
 </pre>
 
 <p>Consider including event listeners and handlers within the
   <a href="app_lifecycle#create_event_page">event page</a>,
 so that notifications can pop-up even when the app or extension isn't running.
 </p>