Remove $FreeBSD$: two-line nroff pattern

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

tabs: a hacky version of tabs appeared in 1st edition Unix

First edition Unix had an /etc/tabs file. It contained the escape
sequences to set tabs to every 8 stops on an old Teletype Model 37 and
compatible terminals. One would 'cat /etc/tabs' to reset them. Unix at
the time effectively mandated this because the delays in the tty driver
assumed this and tabs didn't work when they were too different from '8'.
Document this historical niggle in HISTORY after it was brought to my
attention on a Hacker News thread.

Sponsored by: Netflix

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

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.

- Import the HEAD csup code which is the basis for the cvsmode work.

Added the EXIT STATUS section where appropriate.

mdoc(7) police: markup polishing.

Approved by: re

Note that this appeared at least as early as PWB UNIX.

Use the literal string 'PWB UNIX', as we still have no .At macro for it.

Use the Tn macro for COBOL, FORTRAN, PL/1, SNOBOL.

Expand description of environment variables, refer to environ(7) where
appropriate.

mdoc(7) police: pedantry.

Add an implementation of the tabs(1) utility, as required by SUSv3.

PR: 36126