Fix usage help text in wayland-scanner
Fix usage help text in wayland-scanner

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