Remove .html extension from links

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

 <h1>Bluetooth</h1>
 
 <p>
-  This document describes how to use the <a href="bluetooth.html">Bluetooth
+  This document describes how to use the <a href="bluetooth">Bluetooth
   API</a> to communicate with Bluetooth and Bluetooth Low Energy devices.
 </p>
 
 <p>
   For background information about Bluetooth, see the official
   <a href="http://www.bluetooth.org">Bluetooth specifications</a>.
 </p>
 
 <h2 id="manifest">Manifest requirements</h2>
 
 <p>
   For Chrome Apps that use Bluetooth, add the
-  <a href="manifest/bluetooth.html">bluetooth</a> entry to the manifest
+  <a href="manifest/bluetooth">bluetooth</a> entry to the manifest
   and specify, if appropriate, the UUIDs of profiles, protocols or services
   you wish to implement.
   For example:
 </p>
 
 <pre data-filename="manifest.json">
 "bluetooth": {
   "uuids": [ "1105", "1106" ]
 }
 </pre>
@@ skipping 248 matching lines @@
 <pre>
 chrome.bluetooth.getDevices(function(devices) {
   for (var i = 0; i < devices.length; i++) {
     if (devices[0].vendorIdSource != undefined) {
       console.log(devices[0].address + ' = ' + devices[0].type);
     }
   }
 });
 </pre>