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)

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Update man pages after VFS_* changes in r191990.

Approved by: brueffer, attilio

Move the description of MNT_FORCE closer to mntflags and use a .Bl
list for the valid flag values. This way, if VFS_UNMOUNT(9) supports
more flags in the future, adding a single list item is going to be
easy and all the flags are going to be in one place.

Mdoc Janitor:

* Use 'manual' instead of 'man' for consistency.

Some mdoc(7) fixes:

Nuke incorrect usage of .Ar; replace it with .Vt, .Va or .Fa appropriately.
The .Ar mdoc(7) specifier should only be used when displaying command line
arguments.

Approved by: des (mentor)

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

Approved by: re

Update function definitions and required include files to reflect
the current state of the system.

Approved by: alfred

mdoc(7) police: Use the new .In macro for #include statements.

$Id$ -> $FreeBSD$

FIxed missing include in synopsis.

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

Sort cross refereces in section SEE ALSO.

This is the current draft of my filesystem manpages. Some files are
incomplete and some are just placeholders but I wanted to try to get
something at least into 2.2 on the grounds that what I have is a lot
better than nothing. I also wanted to commit something which documents
the interfaces in 2.2 before I start updating the documentation for 3.0.

This is a definite 2.2 candidate and is also relavent to 2.1 if people
still care about that branch.