minor javadoc update
minor javadoc update

keijokapp/digidoc4j,open-eid/digidoc4j,fazz/digidoc4j,antonioaraujob/digidoc4j,open-eid/digidoc4j,open-eid/digidoc4j,fazz/digidoc4j,keijokapp/digidoc4j,antonioaraujob/digidoc4j