scsi: mpt3sas: fix header path in ioctl documentation

MPT2_MAGIC_NUMBER as well as drivers/scsi/mpt2sas/mpt2sas_ctl.h were
removed to reuse mpt3sas code since commit 09ec55ed74 ("mpt2sas: Remove
.c and .h files from mpt2sas driver").

Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@osnexus.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/ioctl/ioctl-number.txt

@@ -151,7 +151,7 @@ Code  Seq#(hex)	Include File		Comments
 'J'	00-1F	drivers/scsi/gdth_ioctl.h
 'K'	all	linux/kd.h
 'L'	00-1F	linux/loop.h		conflict!
-'L'	10-1F	drivers/scsi/mpt2sas/mpt2sas_ctl.h	conflict!
+'L'	10-1F	drivers/scsi/mpt3sas/mpt3sas_ctl.h	conflict!
 'L'	20-2F	linux/lightnvm.h
 'L'	E0-FF	linux/ppdd.h		encrypted disk device driver
 					<http://linux01.gwdg.de/~alatham/ppdd.html>