message: action: add variable name to header definitons
diff: @@ -34,12 +34,12 @@ public:
  Result land() const;
  Result return_to_land() const;
  - void arm_async(CallbackData);
  - void disarm_async(CallbackData);
  - void kill_async(CallbackData);
  - void takeoff_async(CallbackData);
  - void land_async(CallbackData);
  - void return_to_land_async(CallbackData);
  + void arm_async(CallbackData callback_data);
  + void disarm_async(CallbackData callback_data);
  + void kill_async(CallbackData callback_data);
  + void takeoff_async(CallbackData callback_data);
  + void land_async(CallbackData callback_data);
  + void return_to_land_async(CallbackData callback_data);
  // Non-copyable
  Action(const Action &) = delete;
  