docs/181353: [handbook] Remove KDE3

[wblock at FreeBSD.org]

Synopsis: [handbook] Remove KDE3

Responsible-Changed-From-To: freebsd-doc->wblock
Responsible-Changed-By: wblock
Responsible-Changed-When: Sat Aug 17 14:20:49 UTC 2013
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=181353