- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

mdoc: move CAVEATS, BUGS and SECURITY CONSIDERATIONS sections to the
bottom of the manpages and order them consistently.

GNU groff doesn't care about the ordering, and doesn't even mention
CAVEATS and SECURITY CONSIDERATIONS as common sections and where to put
them.

Found by: mdocml lint run
Reviewed by: ru

Markup fixes.

- s/UltraSparc/UltraSPARC/
- Add info about the requirement of OFW support.

Replace the .Pq added in rev 1.2 with literal parenthesis as the former
aren't required for plain text and the latter formats faster.

Pointed out by: ru

- Use full name of the Sun PGX64 cards and add the Sun part number
in order to simplify matters for people who are looking for a video
card supported by FreeBSD/sparc64.
- Add Sun PGX to the list of known working cards.

MFC after: 1 day

Document a lot of sparc64 internals.

Submitted by: marius
Reviewed by: ru
Approved by: re (blanket)
X-MFC: not before the code in RELENG_5 matches
these man pages or vice versa