scsi: qla4xxx: Fix-up incorrectly documented parameter

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>