Don't document an absent parameter.
Don't document an absent parameter.

Quells a doxygen warning:

  src/wayland-server.c:790: warning: argument 'None' of command @param is
  not found in the argument list of wl_display::wl_display_create(void)

Signed-off-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>

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