Route::Part: Specify ->via documentation, fix arrayref vs. hashref mixup

lib/Travel/Routing/DE/EFA/Route/Part.pm

@@ -310,10 +310,9 @@ In those cases, B<train_destination> and B<train_line> are usually empty.
 
 =item $part->via
 
-List of stops passed between departure_stop and arrival_stop, as
-C<< [ "DD.MM.YYYY", "HH:MM", stop, platform ] >> hashrefs.
-
-May be empty, these are not always reported by efa.vrr.de.
+Returns a list of C<< [ "DD.MM.YYYY", "HH:MM", stop, platform ] >> arrayrefs
+encoding the stops passed between B<departure_stop> and B<arrival_stop>,
+if supported by the backend. Returns nothing / an empty list otherwise.
 
 =back