AC_AutoTune: rename dataflash to logger

libraries/AC_AutoTune/AC_AutoTune.cpp

@@ -168,7 +168,6 @@ bool AC_AutoTune::init_internals(bool _use_poshold,
         if (success) {
             // reset gains to tuning-start gains (i.e. low I term)
             load_gains(GAIN_INTRA_TEST);
-            // write dataflash log even and send message to ground station
             Log_Write_Event(EVENT_AUTOTUNE_RESTART);
             update_gcs(AUTOTUNE_MESSAGE_STARTED);
         }
@@ -196,7 +195,6 @@ void AC_AutoTune::stop()
     // re-enable angle-to-rate request limits
     attitude_control->use_sqrt_controller(true);
 
-    // log off event and send message to ground station
     update_gcs(AUTOTUNE_MESSAGE_STOPPED);
     Log_Write_Event(EVENT_AUTOTUNE_OFF);