libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths

libsys: relocate implementations and manpages

Remove core system call implementations and documentation to lib/libsys
and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>.
Update paths to allow libc to find them in their new home.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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Remove $FreeBSD$: two-line nroff pattern

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

Expand *n't contractions.

Mechanically kill hard sentence breaks.

mdoc(7) police: Tidy up the syscall language.

Stop calling system calls "function calls".

Use "The .Fn system call" a-la "The .Nm utility".

When referring to a non-BSD implementation in
the HISTOR

mdoc(7) police: Tidy up the syscall language.

Stop calling system calls "function calls".

Use "The .Fn system call" a-la "The .Nm utility".

When referring to a non-BSD implementation in
the HISTORY section, call syscall a function,
to be safe.

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mdoc(7) police: Use the new .In macro for #include statements.

Add cross-references for the new kldsym(2) man page.

Unify SEE ALSO sections of the kld*.2 and mod*.2 manpages.
Previously, some useful xrefs were missing.
Now each of the pages refers to all remaining section 2 pages,
to the kld(4) page, and to a rela

Unify SEE ALSO sections of the kld*.2 and mod*.2 manpages.
Previously, some useful xrefs were missing.
Now each of the pages refers to all remaining section 2 pages,
to the kld(4) page, and to a related utility's (section 8) page.

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mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: Er macro usage cleanup.

Add man pages for mod*(2). Shamelessly cut/pasted from the kld*(2) man
pages by Chris Costello.