bin/49895: Bad cross-ref in drvctl(8) man page

[paul%whooppee.com@localhost]

>Number:         49895
>Category:       bin
>Synopsis:       Bad cross-ref in drvctl(8) man page
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 13 03:40:00 +0000 2015
>Originator:     paul%whooppee.com@localhost
>Release:        NetBSD 7.99.15
>Organization:
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| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd.org  |
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>Environment:
System: NetBSD pokey.whooppee.com 7.99.15 NetBSD 7.99.15 (POKEY 2015-04-09 09:49:29) #1: Sun May 3 17:01:17 PHT 2015 paul%pokey.whooppee.com@localhost:/build/netbsd-local/obj/amd64/sys/arch/amd64/compile/POKEY amd64
Architecture: x86_64
Machine: amd64
>Description:
	The drvctl(8) man page includes a cross-reference (in the first
	paragraph) to drvctl(4) device.  However, there is no drvctl(4)
	man page.
>How-To-Repeat:
	man 8 drvctl
>Fix:
	The best solution:  document the drvctl(4) device, including all
	of its interfaces (presumably, ioctl's).

	Worst solution: replace the '.Xr drvctl 4' directive in the
	section 8 man page with a '.Nm' directive?