protocol: Add a bit of documentation
protocol: Add a bit of documentation

abooij/wayland,bitfactor/wayland,eyolfson/wayland,sir-murray/wayland,mchalupa/wayland,bitfactor/wayland,tulcod/wayland,bitfactor/wayland,abooij/wayland,eyolfson/wayland,mchalupa/wayland,abooij/wayland,mchalupa/wayland,sir-murray/wayland,eyolfson/wayland,tulcod/wayland,tulcod/wayland,sir-murray/wayland