scsi: qla4xxx: Repair function documentation headers

Fix one formatting issue, one misspelling and three missing descriptions.

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

drivers/scsi/qla4xxx/ql4_isr.c:588: warning: Excess function parameter 'ret' description in 'qla4_83xx_loopback_in_progress'
drivers/scsi/qla4xxx/ql4_isr.c:661: warning: Function parameter or member 'mbox_status' not described in 'qla4xxx_isr_decode_mailbox'
drivers/scsi/qla4xxx/ql4_isr.c:661: warning: Excess function parameter 'mailbox_status' description in 'qla4xxx_isr_decode_mailbox'
drivers/scsi/qla4xxx/ql4_isr.c:1053: warning: Function parameter or member 'intr_status' not described in 'qla4_82xx_interrupt_service_routine'
drivers/scsi/qla4xxx/ql4_isr.c:1078: warning: Function parameter or member 'intr_status' not described in 'qla4xxx_interrupt_service_routine'

Link: https://lore.kernel.org/r/[e-mail]
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/qla4xxx/ql4_isr.c

···
 /**
  * qla4_83xx_loopback_in_progress: Is loopback in progress?
  * @ha: Pointer to host adapter structure.
- * @ret: 1 = loopback in progress, 0 = loopback not in progress
+ * returns: 1 = loopback in progress, 0 = loopback not in progress
  **/
 static int qla4_83xx_loopback_in_progress(struct scsi_qla_host *ha)
 {
···
 /**
  * qla4xxx_isr_decode_mailbox - decodes mailbox status
  * @ha: Pointer to host adapter structure.
- * @mailbox_status: Mailbox status.
+ * @mbox_status: Mailbox status.
  *
  * This routine decodes the mailbox status during the ISR.
  * Hardware_lock locked upon entry. runs in interrupt context.
···
 /**
  * qla4_82xx_interrupt_service_routine - isr
  * @ha: pointer to host adapter structure.
+ * @intr_status: Local interrupt status/type.
  *
  * This is the main interrupt service routine.
  * hardware_lock locked upon entry. runs in interrupt context.
···
 /**
  * qla4xxx_interrupt_service_routine - isr
  * @ha: pointer to host adapter structure.
+ * @intr_status: Local interrupt status/type.
  *
  * This is the main interrupt service routine.
  * hardware_lock locked upon entry. runs in interrupt context.