docs/library/bluetooth.rst: Fix typo in HR/UART services example.

Author: dpgeorge

docs/library/bluetooth.rst

@@ -214,7 +214,7 @@ writes from a central to a given characteristic, use
 
         HR_UUID = bluetooth.UUID(0x180D)
         HR_CHAR = (bluetooth.UUID(0x2A37), bluetooth.FLAG_READ | bluetooth.FLAG_NOTIFY,)
-        HR_SERVICE = (HR_SERVICE, (HR_CHAR,),)
+        HR_SERVICE = (HR_UUID, (HR_CHAR,),)
         UART_UUID = bluetooth.UUID('6E400001-B5A3-F393-E0A9-E50E24DCCA9E')
         UART_TX = (bluetooth.UUID('6E400003-B5A3-F393-E0A9-E50E24DCCA9E'), bluetooth.FLAG_READ | bluetooth.FLAG_NOTIFY,)
         UART_RX = (bluetooth.UUID('6E400002-B5A3-F393-E0A9-E50E24DCCA9E'), bluetooth.FLAG_WRITE,)