Bluetooth: add socket & low_energy manifest check

chrome/common/extensions/docs/templates/articles/manifest/bluetooth.html

 <h1>Manifest - Bluetooth</h1>
 
 <p>
 The <code>bluetooth</code> manifest property declares which permissions are
 available for the $(ref:bluetooth) API.
 </p>
 
 <h2 id="manifest">Sample manifest.json</h2>
 <pre data-filename="manifest.json">
 {
   "name": "My Bluetooth {{platform}}",
   "bluetooth": {
-    // Permission for chrome.bluetooth.addProfile:
+    // Permission for chrome.bluetoothSocket:
     // The application is allowed to communicate with devices
     // using the protocols, profiles, or services identified by
-    // the UUIDs 0x1105 and 0x1106.
-    "uuids": [ "1105", "1106" ]
+    // the UUIDs 0x1105 and 0x1106 using the BluetoothSocket API.
+    "uuids": [ "1105", "1106" ],
+    "socket": true
   },
   ...
 }
+</pre>
+
+<pre data-filename="manifest.json">
+{
+  "name": "My Bluetooth {{platform}}",
+  "bluetooth": {
+    // Permission for chrome.bluetoothLowEnergy:
+    // The application is allowed to communicate with devices
+    // using the profiles identified by the UUIDs 0x180D, 0x1809 and 0x180F
+    // using the BluetoothLowEnergy API.
+    "uuids": [ "180D", "1809", "180F" ],
+    "low_energy": true
+  },
+  ...
+}
 </pre>
 
 <section>
 <h2 id="reference">Reference</h2>
 <p class="api_reference">
 {{+partials.type type:apis.manifestTypes.byName.bluetooth/}}
 </p>
 </section>