Documentation: fix minor kernel-doc warnings

This patch updates the comments to match the actual code.

Signed-off-by: Martin Waitz <tali@admingilde.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 5b26af85..e112d1a 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1740,7 +1740,7 @@
 
 /**
  * blk_cleanup_queue: - release a &request_queue_t when it is no longer needed
- * @q:    the request queue to be released
+ * @kobj:    the kobj belonging of the request queue to be released
  *
  * Description:
  *     blk_cleanup_queue is the pair to blk_init_queue() or