docs/186663: [handbook] mention old xorg in handbook

[linimon at FreeBSD.org]

Old Synopsis: Old xorg installed and not running
New Synopsis: [handbook] mention old xorg in handbook

Responsible-Changed-From-To: freebsd-ports-bugs->freebsd-doc
Responsible-Changed-By: linimon
Responsible-Changed-When: Sun Feb 16 23:35:42 UTC 2014
Responsible-Changed-Why: 
reclassify.

http://www.freebsd.org/cgi/query-pr.cgi?pr=186663