Obviously clarify that in-memory transport works within single process only
Obviously clarify that in-memory transport works within single process only

Based on [answer](http://stackoverflow.com/a/34596918) from @phatboyg

Former-commit-id: 24532aeb84ce7f5db26c104c93ec9c15589e370a
SanSYS/MassTransit,MassTransit/MassTransit,SanSYS/MassTransit,phatboyg/MassTransit,MassTransit/MassTransit,jacobpovar/MassTransit,jacobpovar/MassTransit,phatboyg/MassTransit