A few edits to README to clarify some features/terminology
A few edits to README to clarify some features/terminology

TiagoMaiaL/mockery,5outh/mockery,tfrommen/mockery,kminh/mockery,yeka/mockery,TiagoMaiaL/mockery,tfrommen/mockery,majisti/mockery,Big-Shark/mockery,florianeckerstorfer/mockery,fhinkel/mockery,fhinkel/mockery,jenswiese/mockery,yeka/mockery,Big-Shark/mockery,5outh/mockery,florianeckerstorfer/mockery,jenswiese/mockery,kminh/mockery,padraic/mockery