drm/docs: More links for implicit/explicit fencing.

drm_atomic_set_fence_for_plane() contains the main discussion from a
driver pov, link to that from more places.

Cc: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603142848.26487-1-daniel.vetter@ffwll.ch
diff --git a/include/drm/drm_plane.h b/include/drm/drm_plane.h
index 6078c70..cd5903a 100644
--- a/include/drm/drm_plane.h
+++ b/include/drm/drm_plane.h
@@ -69,7 +69,7 @@ struct drm_plane_state {
 	 *
 	 * Optional fence to wait for before scanning out @fb. The core atomic
 	 * code will set this when userspace is using explicit fencing. Do not
-	 * write this directly for a driver's implicit fence, use
+	 * write this field directly for a driver's implicit fence, use
 	 * drm_atomic_set_fence_for_plane() to ensure that an explicit fence is
 	 * preserved.
 	 *