docs/189388: [handbook] Release (releng) documention uses deprecated `sysinstall'

[linimon at FreeBSD.org]

Old Synopsis: Release (releng) document uses deprecated `sysinstall'
New Synopsis: [handbook] Release (releng) documention uses deprecated `sysinstall'

Responsible-Changed-From-To: freebsd-bugs->freebsd-doc
Responsible-Changed-By: linimon
Responsible-Changed-When: Tue May 6 03:05:16 UTC 2014
Responsible-Changed-Why: 
applies to the handbook.

http://www.freebsd.org/cgi/query-pr.cgi?pr=189388