docs/159650: [handbook] dumpdev variable was changed to "no" on September 2009

[ryusuke at FreeBSD.org]

Synopsis: [handbook] dumpdev variable was changed to "no" on September 2009

Responsible-Changed-From-To: freebsd-doc->ryusuke
Responsible-Changed-By: ryusuke
Responsible-Changed-When: Sat Aug 20 14:33:12 UTC 2011
Responsible-Changed-Why: 
I'll take this.

http://www.freebsd.org/cgi/query-pr.cgi?pr=159650