Fix typo in dhcp-options.5 to change hostname to domainname.
ticket 37649
and \fBconfig-option\fR operators in an expression, in which case it returns
all labels after the first label in the \fBfqdn.fqdn\fR suboption - for
example, if the value of \fBfqdn.fqdn\fR is "foo.example.com.",
-then \fBfqdn.hostname\fR will be "example.com.". If this suboption value
+then \fBfqdn.domainname\fR will be "example.com.". If this suboption value
is not set, it means that an unqualified name was sent in the \fBfqdn\fR option,
or that no \fBfqdn\fR option was sent at all.
.RE