FlightTask: comment fixes

src/lib/FlightTasks/tasks/FlightTask.cpp

src/lib/FlightTasks/tasks/FlightTask.hpp

src/lib/FlightTasks/tasks/FlightTaskAuto.hpp

src/lib/FlightTasks/tasks/FlightTaskAutoLine.cpp

src/lib/FlightTasks/tasks/FlightTaskAutoLine.hpp

src/modules/mc_pos_control/PositionControl.cpp