Fix cut&paste error having command named domif-setlink instead of
domif-getlink.
state are "up" and "down. If --persistent is specified, only the persistent
configuration of the domain is modified.
-=item B<domif-setlink> I<domain> I<interface-MAC> I<--persistent>
+=item B<domif-getlink> I<domain> I<interface-MAC> I<--persistent>
Query link state of the domain's virtual interface. If --persistent
is specified, query the persistent configuration.