ata: libata: Fix W=1 compilation warning

Commit c494708d ("ata: libata: Cleanup libata-transport")
inadvertently changed the name of the link argument to ata_link in the
kdoc description of ata_tlink_add(), causing warnings to be issue when
compiling with W=1:

drivers/ata/libata-transport.c:690: warning: Function parameter or
struct member 'link' not described in 'ata_tlink_add'
drivers/ata/libata-transport.c:690: warning: Excess function parameter
'ata_link' description in 'ata_tlink_add'

Change the kdoc argument name to "link" to avoid these warnings.

Fixes: c494708d ("ata: libata: Cleanup libata-transport")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

drivers/ata/libata-transport.c

@@ -679,7 +679,7 @@ void ata_tlink_delete(struct ata_link *link)
 
 /**
  * ata_tlink_add  --  initialize an ATA link transport device
- * @ata_link:	struct ata_link owning the link transport device to initialize
+ * @link:	struct ata_link owning the link transport device to initialize
  *
  * Initialize an ATA link transport device for sysfs. It will be added in the
  * device tree below the ATA port it belongs to.