drm/sched: Fix drm_sched_fini() docu generation

Commit baf4afc ("drm/sched: Improve teardown documentation")
added a list of drm_sched_fini()'s problems. The list triggers htmldocs
warning (but renders correctly in htmldocs output):

Documentation/gpu/drm-mm:571: ./drivers/gpu/drm/scheduler/sched_main.c:1359: ERROR: Unexpected indentation.

Separate the list from the preceding paragraph by a blank line to fix
the warning. While at it, also end the aforementioned paragraph by a
colon.

Fixes: baf4afc ("drm/sched: Improve teardown documentation")
Reported-by: Stephen Rothwell <[email protected]>
Closes: https://lore.kernel.org/r/[email protected]/
Signed-off-by: Bagas Sanjaya <[email protected]>
[phasta: Adjust commit message]
Signed-off-by: Philipp Stanner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: bagasme

drivers/gpu/drm/scheduler/sched_main.c

@@ -1355,7 +1355,8 @@ EXPORT_SYMBOL(drm_sched_init);
  * drm_sched_backend_ops.run_job(). Consequently, drm_sched_backend_ops.free_job()
  * will not be called for all jobs still in drm_gpu_scheduler.pending_list.
  * There is no solution for this currently. Thus, it is up to the driver to make
- * sure that
+ * sure that:
+ *
  *  a) drm_sched_fini() is only called after for all submitted jobs
  *     drm_sched_backend_ops.free_job() has been called or that
  *  b) the jobs for which drm_sched_backend_ops.free_job() has not been called