docbook: fix libata content

Fix libata docbook warnings.

Warning(linux-2.6.23-git8//drivers/ata/libata-scsi.c:3251): No description found for parameter 'dev'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/ata/libata-scsi.c

@@ -3240,7 +3240,7 @@ static void ata_scsi_handle_link_detach(struct ata_link *link)
 
 /**
  *	ata_scsi_media_change_notify - send media change event
- *	@atadev: Pointer to the disk device with media change event
+ *	@dev: Pointer to the disk device with media change event
  *
  *	Tell the block layer to send a media change notification
  *	event.