common.xml: document ArduPilot's inconsistency with MAV_CMD_DO_FLIGHTTERMINATION

Author: peterbarker

message_definitions/v1.0/common.xml

@@ -1552,8 +1552,8 @@
       </entry>
       <entry value="185" name="MAV_CMD_DO_FLIGHTTERMINATION" hasLocation="false" isDestination="false">
         <description>Terminate flight immediately.
-          Flight termination immediately and irreversibly terminates the current flight, returning the vehicle to ground.
-          The vehicle will ignore RC or other input until it has been power-cycled.
+          Flight termination immediately and irreversibly terminates the current flight, returning the vehicle to ground.  (n.b. ArduPilot allows several actions to be reversed).
+          The vehicle will ignore RC or other input until it has been power-cycled (n.b. ArduPilot permits RC and other input).
           Termination may trigger safety measures, including: disabling motors and deployment of parachute on multicopters, and setting flight surfaces to initiate a landing pattern on fixed-wing).
           On multicopters without a parachute it may trigger a crash landing.
           Support for this command can be tested using the protocol bit: MAV_PROTOCOL_CAPABILITY_FLIGHT_TERMINATION.