Remove $FreeBSD$: two-line nroff pattern

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

libutil: Fix mandoc warnings

- missing comma before name
- possible typo in section name: Sh CAVEAT instead of CAVEATS
- useless macro: Tn
- blank line in fill mode, using .sp
- no blank before trailing delimiter: Dv NULL?

MFC after: 3 days

libutil: Document function HISTORY within the manpages

Reviewed by: bcr (mentor)
Approved by: bcr (mentor)
MFC after: 7 days
Differential Revision: https://reviews.freebsd.org/D24795

Add caveat to kinfo_getvmmap(3) explaining high CPU utilisation.
Based on kib's reply on https://lists.freebsd.org/pipermail/freebsd-hackers/2016-July/049710.html

PR: 210904
Submitted by: Yuri Victorovich <yuri AT rawbw DOT com>
Reviewed by: jilles
Approved by: bcr (mentor)
MFC after: 5 days
Differential Revision: https://reviews.freebsd.org/D12004

Add <sys/user.h> to the SYNOPSIS of the kinfo_get*() functions since these
functions all return types that are defined in that header.

MFC after: 1 week

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Spelling fixes.

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Fix copy-and-paste-o's from kinfo_getfile.3 in kinfo_getvmmap.3.

MFC after: 3 days

Note that the structures are defined in <sys/user.h> in the text (using
language from stat(2)) rather than in the synopsis.

Requested by: bde

- Note that these interfaces require <sys/user.h> for the structure
definitions.
- Note that these functions return NULL on failure.

MFC after: 3 days

Add filler man pages for the kinfo functions I added recently.
While here, hook up the hexdump(3) man page which wasn't being installed.