xwayland: Add a man page

Xwayland was missing a man page, add one.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Martin Peres <martin.peres@mupuf.org>
4 jobs for xwayland-man in 3 minutes and 53 seconds (queued for 1 second)
Status Job ID Name Coverage
  Docker Image
passed #5503883
debian-testing

00:00:26

 
  Build And Test
passed #5503884
autotools

00:03:27

passed #5503885
meson

00:01:19

passed #5503886
meson-noglamor

00:00:40