drm/sched: Add missing structure comment

Add a missing structure comment for the recently
added @list member.

Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Christian König <christian.koenig@amd.com>
Fixes:  8935ff00 ("drm/scheduler: "node" --> "list"")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Luben Tuikov <luben.tuikov@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/406546/

include/drm/gpu_scheduler.h

@@ -171,10 +171,10 @@ struct drm_sched_fence *to_drm_sched_fence(struct dma_fence *f);
  * struct drm_sched_job - A job to be run by an entity.
  *
  * @queue_node: used to append this struct to the queue of jobs in an entity.
+ * @list: a job participates in a "pending" and "done" lists.
  * @sched: the scheduler instance on which this job is scheduled.
  * @s_fence: contains the fences for the scheduling of job.
  * @finish_cb: the callback for the finished fence.
- * @node: used to append this struct to the @drm_gpu_scheduler.pending_list.
  * @id: a unique id assigned to each job scheduled on the scheduler.
  * @karma: increment on every hang caused by this job. If this exceeds the hang
  *         limit of the scheduler then the job is marked guilty and will not