block: fix kernel-docbook parameters and files

kernel-doc for block/:
- add missing parameters
- fix one function's parameter list (remove blank line)
- add 2 source files to docbook for non-exported kernel-doc functions

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

block/blk-core.c

@@ -1768,6 +1768,7 @@ static inline void __end_request(struct request *rq, int uptodate,
 
 /**
  * blk_rq_bytes - Returns bytes left to complete in the entire request
+ * @rq: the request being processed
  **/
 unsigned int blk_rq_bytes(struct request *rq)
 {
@@ -1780,6 +1781,7 @@ EXPORT_SYMBOL_GPL(blk_rq_bytes);
 
 /**
  * blk_rq_cur_bytes - Returns bytes left to complete in the current segment
+ * @rq: the request being processed
  **/
 unsigned int blk_rq_cur_bytes(struct request *rq)
 {

block/blk-settings.c

@@ -294,7 +294,6 @@ EXPORT_SYMBOL(blk_queue_stack_limits);
 
 /**
  * blk_queue_dma_drain - Set up a drain buffer for excess dma.
- *
  * @q:  the request queue for the device
  * @dma_drain_needed: fn which returns non-zero if drain is necessary
  * @buf:	physically contiguous buffer