message: core: removed some unneeded older comments
diff: @@ -71,13 +71,9 @@ public:
  typedef std::function<void(MAVLinkCommands::Result, float)> command_result_callback_t;
  - // FIXME: I tried to use templates for these;
  - // but I get undefined reference. Need to dig it later.
  MAVLinkCommands::Result send_command(MAVLinkCommands::CommandLong &command);
  MAVLinkCommands::Result send_command(MAVLinkCommands::CommandInt &command);
  - // FIXME: I tried to use templates for these;
  - // but I get undefined reference. Need to dig it later.
  void send_command_async(MAVLinkCommands::CommandLong &command,
  const command_result_callback_t callback);
  void send_command_async(MAVLinkCommands::CommandInt &command,
  