libata-core: fix kernel-doc warning

Fix libata-core kernel-doc warning:
Warning(linux-2.6.25-rc2-git6//drivers/ata/libata-core.c:168): No description found for parameter 'ap'

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-core.c

@@ -153,7 +153,7 @@ MODULE_VERSION(DRV_VERSION);
 
 /**
  *	ata_force_cbl - force cable type according to libata.force
- *	@link: ATA link of interest
+ *	@ap: ATA port of interest
  *
  *	Force cable type according to libata.force and whine about it.
  *	The last entry which has matching port number is used, so it