docs/162699: Handbook/Upgrading instructions: should mention delete-old in order

[eadler at FreeBSD.org]

Synopsis: Handbook/Upgrading instructions: should mention delete-old in order

Responsible-Changed-From-To: eadler->freebsd-doc
Responsible-Changed-By: eadler
Responsible-Changed-When: Wed Jul 25 06:42:10 UTC 2012
Responsible-Changed-Why: 
I won't be getting to this any time soon

http://www.freebsd.org/cgi/query-pr.cgi?pr=162699