kern/38275: POSIX message queue documentation missing

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>Number:         38275
>Category:       kern
>Synopsis:       POSIX message queue documentation missing
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Mar 22 11:05:00 +0000 2008
>Originator:     Matthew Mondor
>Release:        4.99.55
>Organization:
Pulsar-Zone
>Environment:
NetBSD sat.xisop 4.99.55 NetBSD 4.99.55 (GENERIC_MM) #3: Fri Mar  7 22:04:06 
EST 2008  root%sat.xisop@localhost:/usr/src/sys/arch/i386/compile/GENERIC_MM 
i386
>Description:
In the system roadmap I saw a note about POSIX aio and message queues.
I knew aio was implemented and documented but then tried to look for mq
documentation and couldn't find it, yet the syscalls were implemented.

Since the roadmaps seem to show that the tree for v5 might be cut pretty
soon, I thought this PR was necessary as a reminder to fix the
documentation before branching occurs...
>How-To-Repeat:
apropos posix; apropos mq :)
>Fix: