Document r263662, 800.loginfail refinement.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Remove content-less sections.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Whitespace cleanup.  No content changes.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
In installation/article.xml:

 - Update references from 9.1R to 9.3R.
 - Remove CVS reference.
 - Update list of earlier FreeBSD versions to remove
   unsupported versions.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation
Trim errata/article.xml of old entries.

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