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)

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

Approved by: re (hrs)

Fixed the misplaced $FreeBSD$.

Mark lists as in the rest of section 9 manpages.

Submitted by: Joel Dahl (mostly)

Mdoc Janitor:

* Fix hard sentence breaks in VFS_*(9) and VOP_*(9) manual pages.

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

Convert descriptions in the ERRORS section to full sentences if they
were not full sentences, elaborating as necessary.

Style and markup changes only.

Capitalize the first letter of the descriptions for the entries in the ERRORS
section if they are complete sentences and end the sentences with periods.

More file system > filesystem

- Fix a number of man pages broken by the KSE merger.

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

mdoc(7) police: normalize .Nd.

s/of possible/if possible/

Man pages for the VFS extended attribute and access control list vnops.

Reviewed by: eivind