doc: Note strong recommendation to use S-o-b in contributions
doc: Note strong recommendation to use S-o-b in contributions

Signed-off-by: Bryce Harrington <bdb14cfc1ab8d24e13de84adc40b41ae60c13bd1@osg.samsung.com>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

sir-murray/wayland,sir-murray/wayland,sir-murray/wayland