message: example: remove leftover comment
diff: @@ -143,7 +143,6 @@ int main(int /*argc*/, char ** /*argv*/)
  std::cout << "Armed." << std::endl;
  // Before starting the mission, we want to be sure to subscribe to the mission progress.
  - // We pass on device to receive_mission_progress because we need it in the callback.
  device.mission().subscribe_progress(std::bind(&receive_mission_progress, _1, _2));
  {
  