manuals: Misc syntax fixes

These were reported by `mandoc -T lint ...` as errors.

The rendered output (in ascii and html) is not affected by this commit.

Additional clarification: there was a non-

manuals: Misc syntax fixes

These were reported by `mandoc -T lint ...` as errors.

The rendered output (in ascii and html) is not affected by this commit.

Additional clarification: there was a non-breaking space in
lib/libcasper/services/cap_grp/cap_grp.3.

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Tarsnap Backup Inc.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1449

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libcasper: document that most libcasper functions are not thread-safe

And neither are most libcasper services' functions, because internally
they all use cap_xfer_nvlist. cap_xfer_nvlist sends and

libcasper: document that most libcasper functions are not thread-safe

And neither are most libcasper services' functions, because internally
they all use cap_xfer_nvlist. cap_xfer_nvlist sends and then receives
data over a unix domain socket and associated with the cap_channel_t
argument. So absent synchronization, two threads may not use the same
cap_channel_t argument or they risk receiving the other's reply.

MFC after: 2 weeks
Sponsored by: Axcient
Reviewed by: oshogbo
Differential Revision: https://reviews.freebsd.org/D42928

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Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

libcasper(3): Document HISTORY within the manpages

Reviewed by: bcr (mentor)
Approved by: bcr (mentor)
MFC after: 7 days
Differential Revision: https://reviews.freebsd.org/D24695

The gids argument can be declared as const.
We don't modified it in this function.

nv was moved to the 9 section.
Fix reference to it.

Fix typo.

Document the grp Casper service.

Reviewed by: brueffer@, bcr@
Differential Revision: https://reviews.freebsd.org/D13821