docs/187465: [handbook] [patch] mention patchlevels in explaining security advisories

[allanjude at FreeBSD.org]

Synopsis: [handbook] [patch] mention patchlevels in explaining security advisories

Responsible-Changed-From-To: freebsd-doc->allanjude
Responsible-Changed-By: allanjude
Responsible-Changed-When: Mon May 19 18:22:57 UTC 2014
Responsible-Changed-Why: 
I have an improved patch for this outstanding


http://www.freebsd.org/cgi/query-pr.cgi?pr=187465