drm/scheduler: fix documentation by replacing rq_list with sched_list

This also replaces old artifacts with a correct one in drm_sched_entity_init()
declaration

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/scheduler/sched_entity.c

@@ -45,7 +45,7 @@
  * @guilty: atomic_t set to 1 when a job on this queue
  *          is found to be guilty causing a timeout
  *
- * Note: the rq_list should have atleast one element to schedule
+ * Note: the sched_list should have atleast one element to schedule
  *       the entity
  *
  * Returns 0 on success or a negative error code on failure.