Changes

'''BluetoothGatt''' provides bluetooth GATT client functionality to enable communication with a remote GATT server(i.e., remote LE device providing GATT services). Applications have to call [[B2G/Bluetooth/WebBluetooth-v2/BluetoothDevice#connectGatt.28boolean_aAutoConnect.29|device.connectGatt()]] to create a BluetoothGatt for a remote GATT server.