Bluetooth: add module name for btwilink

Btwilink help did not include module name, add it.

Signed-off-by: Pavel Machek <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/bluetooth/Kconfig

···
 	  core driver to communicate with the BT core of the combo chip.
 
 	  Say Y here to compile support for Texas Instrument's WiLink7 driver
-	  into the kernel or say M to compile it as module.
+	  into the kernel or say M to compile it as module (btwilink).
+
 endmenu