scsi: qla2xxx: Improve several kernel-doc headers

This patch avoids that complaints about kernel-doc headers are reported
when building with W=1.

Cc: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>