docs/156853: [patch] Update docs: jail(8) security issues with world-readable jail root

[bcr at FreeBSD.org]

Synopsis: [patch] Update docs: jail(8) security issues with world-readable jail root

Responsible-Changed-From-To: freebsd-doc->bcr
Responsible-Changed-By: bcr
Responsible-Changed-When: Sun May 8 10:54:32 UTC 2011
Responsible-Changed-Why: 
Take this one.

http://www.freebsd.org/cgi/query-pr.cgi?pr=156853