swaygrab: update man page
swaygrab: update man page

colemickens/sway,taiyu-len/sway,crondog/sway,4e554c4c/sway,ascent12/sway,crondog/sway,ptMuta/sway,ascent12/sway,4e554c4c/sway,1ace/sway,colemickens/sway,taiyu-len/sway,johalun/sway,SirCmpwn/sway,1ace/sway,sleep-walker/sway,colemickens/sway,taiyu-len/sway,ascent12/sway,mikkeloscar/sway,mikkeloscar/sway,1ace/sway,sleep-walker/sway