docs/159897: [handbook] [patch] improve HAST section of Handbook

[wblock at FreeBSD.org]

Synopsis: [handbook] [patch] improve HAST section of Handbook

Responsible-Changed-From-To: freebsd-doc->wblock
Responsible-Changed-By: wblock
Responsible-Changed-When: Sun Dec 4 19:06:15 UTC 2011
Responsible-Changed-Why: 
Take.

http://www.freebsd.org/cgi/query-pr.cgi?pr=159897