scanner: expand help string
scanner: expand help string

Signed-off-by: Peter Hutterer <b9c50af7afa7642f6f854434cda9ffe54ece8b85@who-t.net>

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