manuals: Fix errors in .2 pages

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

fhlink.2, fhreadlink.2: remove unneeded block closing.

getfh.2, procctl.2: add necessary block closing.

ptra

manuals: Fix errors in .2 pages

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

fhlink.2, fhreadlink.2: remove unneeded block closing.

getfh.2, procctl.2: add necessary block closing.

ptrace.2: -width only takes one argument.

swapon.2: <sys/vmparam.h> and <vm/swap_pager.h> weren't being displayed,
because .It is for a list item whereas .In is for included files.
Also, we want a blank line between <sys/ > headers and the other
one.

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
PR: 281597
Reviewed by: mhorne
Sponsored by: Tarsnap Backup Inc.

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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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