[PATCH] drm/mode: Improve drm_mode_fb_cmd2 documentation

[Simon Ser]

drm-misc-next has changed this doc comment. Can you rebase your changes?

Any any case, r-b me.

[1]: https://cgit.freedesktop.org/drm/drm-misc/commit/?id=a3574119826d9a4ef807fb973cf5150c3b90da43