ArduCopter: remove comment for already-removed in-delay-callback function

These are now attached to completely unrelated functions, which is
pretty bad.

ArduCopter/GCS_Mavlink.cpp

@@ -1242,12 +1242,6 @@ void GCS_MAVLINK_Copter::handleMessage(const mavlink_message_t &msg)
 } // end handle mavlink
 
 
-/*
- *  a delay() callback that processes MAVLink packets. We set this as the
- *  callback in long running library initialisation routines to allow
- *  MAVLink to process packets while waiting for the initialisation to
- *  complete
- */
 MAV_RESULT GCS_MAVLINK_Copter::handle_flight_termination(const mavlink_command_long_t &packet) {
     MAV_RESULT result = MAV_RESULT_FAILED;