drm/scheduler: fix sched_fence.c kernel-doc warnings

Fix kernel-doc warnings.
drivers/gpu/drm/scheduler/sched_fence.c:110: warning: Function parameter or
member 'f' not described in 'drm_sched_fence_release_scheduled'
drivers/gpu/drm/scheduler/sched_fence.c:110: warning: Excess function
parameter 'fence' description in 'drm_sched_fence_release_scheduled'

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/scheduler/sched_fence.c

@@ -101,7 +101,7 @@ static void drm_sched_fence_free(struct rcu_head *rcu)
 /**
  * drm_sched_fence_release_scheduled - callback that fence can be freed
  *
- * @fence: fence
+ * @f: fence
  *
  * This function is called when the reference count becomes zero.
  * It just RCU schedules freeing up the fence.