docs/155989: [patch] Fix offset in boot.config(5)

[eadler at FreeBSD.org]

Synopsis: [patch] Fix offset in boot.config(5)

Responsible-Changed-From-To: freebsd-doc->eadler
Responsible-Changed-By: eadler
Responsible-Changed-When: Mon Jan 2 15:31:00 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=155989