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): Correct some warnings found by mandoc

- inserting missing end of block: Sh breaks Bl
- moving content out of list: Pp
- missing comma before name: Nm cap_*
- comma in function argument

libcasper(3): Correct some warnings found by mandoc

- inserting missing end of block: Sh breaks Bl
- moving content out of list: Pp
- missing comma before name: Nm cap_*
- comma in function argument: cap_*
- skipping paragraph macro: Pp after Sh
- sections out of conventional order: Sh AUTHORS

Reviewed by: bcr
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D31144

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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

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

Document the syslog Casper service.

Reviewed by: bcr@
Differential Revision: https://reviews.freebsd.org/D14084