drm/ttm: fix kerneldoc for ttm_lru_bulk_move

Update the kerneldoc for the members as well.
Signed-off-by: Christian König <christian.koenig@amd.com>
Fixes: b0e2c9ea ("drm/ttm: allow bulk moves for all domains")
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220413091242.638413-1-christian.koenig@amd.com

include/drm/ttm/ttm_resource.h

@@ -215,8 +215,7 @@ struct ttm_lru_bulk_move_pos {
 /**
  * struct ttm_lru_bulk_move
  *
- * @tt: first/last lru entry for resources in the TT domain
- * @vram: first/last lru entry for resources in the VRAM domain
+ * @pos: first/last lru entry for resources in the each domain/priority
  *
  * Container for the current bulk move state. Should be used with
  * ttm_lru_bulk_move_init() and ttm_bo_set_bulk_move().