docs/177056: typo in link in handbook section 31.4.16

[eadler at FreeBSD.org]

Synopsis: typo in link in handbook section 31.4.16

State-Changed-From-To: open->closed
State-Changed-By: eadler
State-Changed-When: Mon Oct 28 00:19:08 UTC 2013
State-Changed-Why: 
Committed. Thanks!

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