docs/177056: typo in link in handbook section 31.4.16

[jkois at FreeBSD.org]

Synopsis: typo in link in handbook section 31.4.16

Responsible-Changed-From-To: freebsd-www->freebsd-doc
Responsible-Changed-By: jkois
Responsible-Changed-When: Sat Apr 13 10:14:59 UTC 2013
Responsible-Changed-Why: 
Reclassify.

http://www.freebsd.org/cgi/query-pr.cgi?pr=177056