docs/140754: [handbook] Bad example in handbook 18.5.2

[pav at FreeBSD.org]

Synopsis: [handbook] Bad example in handbook 18.5.2

State-Changed-From-To: open->closed
State-Changed-By: pav
State-Changed-When: Mon Dec 14 13:46:44 UTC 2009
State-Changed-Why: 
/mnt is a traditional place for mounts; I think it's fine as an example.
And the user cannot really fill / because of the minfree feature of UFS.

http://www.freebsd.org/cgi/query-pr.cgi?pr=140754