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>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index d63c81e..5237a49 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3240,7 +3240,7 @@
 
 /**
  *	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.