efa(1): add other EFA services to description

B<efa> is a command line client for the L<http://efa.vrr.de> web interface.

It sends the specified information to the online form and displays the results.

It should be noted that B<efa>, although using the web interface of a local

transport association, is able to look up connections all over Germany.

It also supports other EFA services than L<http://efa.vrr.de>.

B<efa> has a builtin list of EFA entry points which can be used with the

B<-A> and B<-D> options. You can also specify a custom URL using B<-u>.

However, the default EFA service is sufficient in most cases (even ICE

connections all over germany).

=head1 OPTIONS