Remove $FreeBSD$: two-line nroff pattern

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

Remove sio(4).
It had been disconnected from build in r181233 in 2008.

Reviewed by: imp

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

use .Mt to mark up email addresses consistently (part2)

PR: 191174
Submitted by: Franco Fichtner <franco@lastsummer.de>

Sort sections.

Eliminated double whitespace.

Mechanically kill hard sentence breaks.

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/
Add FreeBSD Id tag where missing.

The .Nm utility

Talk about what the user needs to do to get the snp devices, and how
watch(8) will try to help them by loading the module.

PR: 25420

Change 'superuser' to 'user' which was forgotten in the previous
delta. Remove fake SCCS id while I'm here.

Remove the sentence about only root being able to run watch(8). It
was never technically true (it's snp(4) that required root, not
watch(8)), and after snp.c 1.64, isn't even effectively true, since

Remove the sentence about only root being able to run watch(8). It
was never technically true (it's snp(4) that required root, not
watch(8)), and after snp.c 1.64, isn't even effectively true, since
who can run watch(8) depends on the permissions of the snp device(s).

Sort options in SYNOPSIS and DESCRIPTION while I'm here.

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Add an -f option which allows one to specify a snp device to use.
Previously, watch would always use the first device it could
successfully open, but this isn't always desired. Specifically, it
may

Add an -f option which allows one to specify a snp device to use.
Previously, watch would always use the first device it could
successfully open, but this isn't always desired. Specifically, it
may not be desired during debugging (of snp), or if a particular snp
device has different permissions (which makes since after snp.c 1.64).

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o When "-n" is used with watch, it disables the use of <control-X> to
change terminals being watched. This change makes watch pass the
<control-X> through to the terminal if it's not being inter

o When "-n" is used with watch, it disables the use of <control-X> to
change terminals being watched. This change makes watch pass the
<control-X> through to the terminal if it's not being intercepted--
previously, the keypress would simply be dropped.

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Replace an instance of the "watch" word with the ".Nm" macro: it is used to
specify the command name.

mdoc(7) police: use the new features of the Nm macro.

Add missing .El.
-Wall cleaning.

``tty'' is not required parameter

$Id$ -> $FreeBSD$

Add $Id$, to make it simpler for members of the translation teams to
track.

The Id line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by

Add $Id$, to make it simpler for members of the translation teams to
track.

The Id line is normally at the bottom of the main comment block in the
man page, separated from the rest of the manpage by an empty comment,
like so;

.\" $Id$
.\"

If the immediately preceding comment is a @(#) format ID marker than the
the $Id$ will line up underneath it with no intervening blank lines.
Otherwise, an additional blank line is inserted.

Approved by: bde

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.Sh AUTHOR -> .Sh AUTHORS. Use .An/.Aq.

Use err(3).

Sort cross references.