drm/vkms: Update vkms_composer_worker documentation

Since commit ba420afa ("drm/vkms: Bugfix racing hrtimer vblank
handle") the work is scheduled at vkms_vblank_simulate() and since
commit 5ef8100a ("drm/vkms: flush crc workers earlier in commit
flow") the work is flushed at vkms_atomic_commit_tail(). Update function
commment to reflect that.
Signed-off-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220521191342.23520-1-andrealmeid@igalia.com

drivers/gpu/drm/vkms/vkms_composer.c

@@ -213,7 +213,7 @@ static int compose_active_planes(void **vaddr_out,
  *
  * Work handler for composing and computing CRCs. work_struct scheduled in
  * an ordered workqueue that's periodically scheduled to run by
- * _vblank_handle() and flushed at vkms_atomic_crtc_destroy_state().
+ * vkms_vblank_simulate() and flushed at vkms_atomic_commit_tail().
  */
 void vkms_composer_worker(struct work_struct *work)
 {