Remove duplicate "the". From Henning Petersen in PR 44640.

Get rid of SYSCTL_SETUP.

We want the sysctl variables also when mqueue(3) is loaded as a module.

Grammar and spacing fixes.

Remove some leftover .\" comments.

The sysctl variables will be described in sysctl(7).

Add mq(3), a manual page for the POSIX message queues. This tries to act as
a short introduction to the rationale and API, noting also some pros and cons.

rmind@: basically ok. Please feel free to a

Add mq(3), a manual page for the POSIX message queues. This tries to act as
a short introduction to the rationale and API, noting also some pros and cons.

rmind@: basically ok. Please feel free to adjust, correct, and extend.

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