Update i3-msg.man: added get_config and send_tick
Update i3-msg.man: added get_config and send_tick

Added get_config and send_tick which are mentioned [here](https://i3wm.org/docs/ipc.html).
i3/i3,Airblader/i3-original,Airblader/i3,Airblader/i3,Airblader/i3-original,i3/i3,i3/i3,Airblader/i3,Airblader/i3-original,stapelberg/i3,stapelberg/i3,Airblader/i3-original,stapelberg/i3,Airblader/i3-original,Airblader/i3,i3/i3,stapelberg/i3