Fix typo in architecture documentation
Fix typo in architecture documentation

RBMHTechnology/eventuate,RBMHTechnology/eventuate,RBMHTechnology/eventuate,ianclegg/eventuate,ianclegg/eventuate,RBMHTechnology/eventuate,RBMHTechnology/eventuate,ianclegg/eventuate,ianclegg/eventuate,ianclegg/eventuate