scsi: qla4xxx: Fix-up incorrectly documented parameter

Also demote incomplete header from kerneldoc.

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

from  drivers/scsi/qla4xxx/ql4_mbx.c:9:
 drivers/scsi/qla4xxx/ql4_mbx.c:53: warning: Excess function parameter 'ret' description in 'qla4xxx_is_intr_poll_mode'
 drivers/scsi/qla4xxx/ql4_mbx.c:832: warning: Function parameter or member 'fw_ddb_entry_dma' not described in 'qla4xxx_get_fwddb_entry'
 drivers/scsi/qla4xxx/ql4_mbx.c:832: warning: Function parameter or member 'conn_err_detail' not described in 'qla4xxx_get_fwddb_entry'
 drivers/scsi/qla4xxx/ql4_mbx.c:832: warning: Function parameter or member 'tcp_source_port_num' not described in 'qla4xxx_get_fwddb_entry'
 drivers/scsi/qla4xxx/ql4_mbx.c:832: warning: Function parameter or member 'connection_id' not described in 'qla4xxx_get_fwddb_entry'
 drivers/scsi/qla4xxx/ql4_mbx.c:1271: warning: Function parameter or member 'ddb_entry' not described in 'qla4xxx_reset_target'
 drivers/scsi/qla4xxx/ql4_mbx.c:1271: warning: Excess function parameter 'db_entry' description in 'qla4xxx_reset_target'
 drivers/scsi/qla4xxx/ql4_mbx.c:1271: warning: Excess function parameter 'un_entry' description in 'qla4xxx_reset_target'

Link: https://lore.kernel.org/r/20200721164148.2617584-22-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_mbx.c

@@ -47,7 +47,7 @@ void qla4xxx_process_mbox_intr(struct scsi_qla_host *ha, int out_count)
 /**
  * qla4xxx_is_intr_poll_mode – Are we allowed to poll for interrupts?
  * @ha: Pointer to host adapter structure.
- * @ret: 1=polling mode, 0=non-polling mode
+ * returns: 1=polling mode, 0=non-polling mode
  **/
 static int qla4xxx_is_intr_poll_mode(struct scsi_qla_host *ha)
 {
@@ -810,7 +810,7 @@ int qla4xxx_get_firmware_status(struct scsi_qla_host * ha)
 	return QLA_SUCCESS;
 }
 
-/**
+/*
  * qla4xxx_get_fwddb_entry - retrieves firmware ddb entry
  * @ha: Pointer to host adapter structure.
  * @fw_ddb_index: Firmware's device database index
@@ -1259,8 +1259,7 @@ int qla4xxx_reset_lun(struct scsi_qla_host * ha, struct ddb_entry * ddb_entry,
 /**
  * qla4xxx_reset_target - issues target Reset
  * @ha: Pointer to host adapter structure.
- * @db_entry: Pointer to device database entry
- * @un_entry: Pointer to lun entry structure
+ * @ddb_entry: Pointer to device database entry
  *
  * This routine performs a TARGET RESET on the specified target.
  * The caller must ensure that the ddb_entry pointers