Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

More mdoc nitpicking to improve compatibility to mdocml

- .Nd in section NAME is not optional
- .Ed was missing
- "indent" is not a flag, but a literal argument for -offset
- stop switching font sizes for acronyms
- use .Brq instead of rolling our own

[0] Improve wording.
[1] Following style for manpages, just do carriage return after a
sentence.

Sponsored by: Sandvine Incorporated
[0] Submitted by: emaste
[1] Submitted by: rwatson

Adjust the manpage after r207329.

Sponsored by: Sandvine Incorporated
Reviewed by: cpercival, emaste, marcel
X-MFC: r207329

Update .Dt on these man pages: the kernel modules and corresponding man
pages are installed on more platforms than just i386.

Move man pages out of man4.i386. Most of them are applicable to amd64
too, so, instead of descending to the i386 directory, we add some magic to
the parent Makefile.
These man pages refer to drivers that I'm aware that work on amd64. Most
likely there are more, but I'll deal with them later.

Approved by: brueffer, philip, takawata

Add a SYNOPSIS section for io(4), mem(4), or random(4), since they are
now optional devices.

MFC after: 1 week

Mechanically kill hard sentence breaks and double whitespaces.

mdoc(7) police: fix SEE ALSO.

Update io(4) to match reality following revision 1.42 of
sys/i386/i386/mem.c: only the super-user may open /dev/io
regardless of the device permissions (just 4 years late!).

Also, add cross-reference to i386_{get,set}_ioperm(2).

PR: kern/13359

mdoc(7) police:

Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text.
Not only this slows down the mdoc(7) processing significantly, but it also
has an undesired (in this case) effect of disabling hyphenation within the
entire enclosed block.

mdoc(7) police: use canonical form of .Dd macro.

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

$Id$ -> $FreeBSD$

Use the .Fx macro for FreeBSD references for releases prior to 2.0.
Use the .Tn macro for generic FreeBSD references. Cleanup other
formatting problems noticed while making the above changes.

Revert $FreeBSD$ back to $Id$

Fix a bunch of man pages to stop abusing the .Nm macro, along
with some other minor fixes for some problems I noticed
while making these changes.

Pointed out by: bde

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Document the /dev/io security hole.