drm/ttm/ttm_bo: Provide a missing 'bulk' description and correct misnaming of 'placement'

'bulk' description taken from another in the same file.

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/ttm/ttm_bo.c:98: warning: Function parameter or member 'bulk' not described in 'ttm_bo_set_bulk_move'
 drivers/gpu/drm/ttm/ttm_bo.c:768: warning: Function parameter or member 'placement' not described in 'ttm_bo_mem_space'
 drivers/gpu/drm/ttm/ttm_bo.c:768: warning: Excess function parameter 'proposed_placement' description in 'ttm_bo_mem_space'
Signed-off-by: Lee Jones <lee@kernel.org>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230317081718.2650744-6-lee@kernel.org

drivers/gpu/drm/ttm/ttm_bo.c

@@ -84,6 +84,7 @@ EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
  * ttm_bo_set_bulk_move - update BOs bulk move object
  *
  * @bo: The buffer object.
+ * @bulk: bulk move structure
  *
  * Update the BOs bulk move object, making sure that resources are added/removed
  * as well. A bulk move allows to move many resource on the LRU at once,
@@ -748,7 +749,7 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
  *
  * @bo: Pointer to a struct ttm_buffer_object. the data of which
  * we want to allocate space for.
- * @proposed_placement: Proposed new placement for the buffer object.
+ * @placement: Proposed new placement for the buffer object.
  * @mem: A struct ttm_resource.
  * @ctx: if and how to sleep, lock buffers and alloc memory
  *