Docserver: Fix typo in app_bluetooth.html

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</a>,
   <a href="bluetoothSocket.html">Bluetooth Socket</a> and
   <a href="bluetoothLowEnergy.html">Bluetooth Low Energy</a> APIs to
   communicate with Bluetooth and Bluetooth Low Energy devices.
 </p>
 
 <p>
@@ skipping 776 matching lines @@
   // Do stuff with the bytes.
   ...
 });
 </pre>
 
 <p>
   Some characteristics are writable, especially those that behave as "Control
   Points", where writing the value has side effects. For example, the <em>Heart
   Rate Control Point</em> characteristic is used to tell a heart rate sensor to
   reset its count of total calories burned and only supports writes. To achieve
-  this, Chrome provides the $(ref:bluetootLowEnergy.writeCharacteristicValue)
+  this, Chrome provides the $(ref:bluetoothLowEnergy.writeCharacteristicValue)
   method:
 </p>
 
 <pre>
 var myBytes = new Uint8Array([ ... ]);
 chrome.bluetoothLowEnergy.writeCharacteristicValue(chrc.instanceId,
                                                    myBytes.buffer,
                                                    function() {
   if (chrome.runtime.lastError) {
     console.log('Failed to write value: ' +
@@ skipping 112 matching lines @@
 
 <p>
   <span style="font-weight: bold;">NOTE:</span> If a characteristic supports
   notifications/indications, it will have the "Client Characteristic
   Configuration" descriptor to enable/disable notifications. Chrome does not
   permit apps to write to this descriptor. Apps should instead use the
   $(ref:bluetoothLowEnergy.startCharacteristicNotifications) and
   $(ref:bluetoothLowEnergy.stopCharacteristicNotifications) methods to control
   notification behavior.
 </p>