docs/168924: remove dead links or correct

[issyl0 at FreeBSD.org]

Synopsis: remove dead links or correct

Responsible-Changed-From-To: freebsd-doc->issyl0
Responsible-Changed-By: issyl0
Responsible-Changed-When: Sun Jun 10 17:02:51 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=168924