Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- We don't install USD docs for games anymore since the games with docs
(trek) aren't in the base system anymore.
- dm(8) isn't in the base system anymore either, so don't xref it either.

Submitted by: Björn König (2)

Sort sections.

DTRT, quote parens in an extended regular expression.

PR: 61668
Submitted by: Oliver Eikemeier <eikemeier@fillmore-labs.com>
MFC after: 1 week

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

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

MAN[1-9] -> MAN.

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

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

Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

$Id$ -> $FreeBSD$

Typo and style fixes.

Add an intro for games.