scsi: ata: libata-scsi: Fix ata_msense_control kdoc comment

Add missing description of the spg argument of ata_msense_control().

Fixes: df60f9c6 ("scsi: ata: libata: Add ATA feature control sub-page translation")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230523074701.293502-1-dlemoal@kernel.orgReviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ata/libata-scsi.c

@@ -3850,6 +3850,7 @@ static unsigned int ata_mselect_control_ata_feature(struct ata_queued_cmd *qc,
 /**
  *	ata_mselect_control - Simulate MODE SELECT for control page
  *	@qc: Storage for translated ATA taskfile
+ *	@spg: target sub-page of the control page
  *	@buf: input buffer
  *	@len: number of valid bytes in the input buffer
  *	@fp: out parameter for the failed field on error