scsi: qla4xxx: Fix incorrectly named function parameter

Fixes the following W=1 kernel build warning(s):

from  drivers/scsi/qla4xxx/ql4_iocb.c:8:
 drivers/scsi/qla4xxx/ql4_iocb.c:87: warning: Function parameter or member 'mrkr_mod' not described in 'qla4xxx_send_marker_iocb'
 drivers/scsi/qla4xxx/ql4_iocb.c:87: warning: Excess function parameter 'marker_type' description in 'qla4xxx_send_marker_iocb'

Link: https://lore.kernel.org/r/20200721164148.2617584-23-lee.jones@linaro.org
Cc: QLogic-Storage-Upstream@qlogic.com
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla4xxx/ql4_iocb.c

@@ -78,7 +78,7 @@ static int qla4xxx_get_req_pkt(struct scsi_qla_host *ha,
  * @ha: Pointer to host adapter structure.
  * @ddb_entry: Pointer to device database entry
  * @lun: SCSI LUN
- * @marker_type: marker identifier
+ * @mrkr_mod: marker identifier
  *
  * This routine issues a marker IOCB.
  **/