doc: Added API documentation for wl_display_destroy and wl_display_add_socket functions.
doc: Added API documentation for wl_display_destroy and wl_display_add_socket functions.

Signed-off-by: Srivardhan Hebbar <659686bdbb7daacc5b9d373146f7f28d52dc661b@samsung.com>
[Pekka Paalanen: minor re-wording.]
Signed-off-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

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