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

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

MFC r233648:
Remove trailing whitespace per mdoc lint warning

Approved by: cperciva (implicit)

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

Approved by: re (implicit)

Note that devfs(5) and fdescfs(5) both create /dev/fd file descriptors.

PR: 144534
Submitted by: Matthew Seaman <m.seaman at infracaninophile co uk>
Patch by: Matthew Seaman, keramida
Approved by: keramida (mentor)
MFC after: 1 week

mdoc: move remaining sections into consistent order

This pertains mostly to FILES, HISTORY, EXIT STATUS and AUTHORS sections.

Found by: mdocml lint run
Reviewed by: ru

Remove reference to mount_fdescfs.

Suggested by: ru

Change reference from mount_devfs(8) to mount(8), and add an example.
Remove reference to mount_fdescfs(8), since mount(8) calls nmount()
directly to mount an fdescfs filesystem, instead of forking an
external mount_fdescfs program.

Deal with unsafe tab characters.

Uniformly refer to a file system as "file system".

Approved by: re

More file system > filesystem

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

Rename (after a repo-copy) some mount(8) programs:

mount_fdesc -> mount_fdescfs
mount_null -> mount_nullfs
mount_portal -> mount_portalfs
mount_umap -> mount_umapfs
mount_union -> mount_unionfs

mdoc(7) police: do not split author names in the AUTHORS section.

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

Document the `new' fdesc--now that it belongs only on /dev/fd, remove all
non-/dev/fd related documentation (such as that for stdin, stdout, tty).

Update the fstab line to refer to /dev/fd instead of /dev.

$Id$ -> $FreeBSD$

Various man page cleanup:

- Sort xrefs
- FreeBSD.ORG -> FreeBSD.org
- Be consistent with section names as outlined in mdoc(7).
- Other misc mdoc cleanup.

PR: doc/13144
Submitted by: Alexey M. Zelkin <phantom@cris.net>

.Sh AUTHOR -> .Sh AUTHORS according to mdoc specs.
Use .An/.Aq.

add missing cvs Id lines.

Fix a small typo that was only apparent when looking
at the man page source..

Add fdesc(5) to document the file-descriptor file system.