[libata] DocBook minor updates, fixes

Update copyright year, fix minor stuff 'make xmldocs' complains about.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 7ab45f4..dce6565 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5741,7 +5741,7 @@
 
 /**
  *	ata_scsi_release - SCSI layer callback hook for host unload
- *	@host: libata host to be unloaded
+ *	@shost: libata host to be unloaded
  *
  *	Performs all duties necessary to shut down a libata port...
  *	Kill port kthread, disable port, and release resources.