docs(Operators): improve documentation on flow operators
docs(Operators): improve documentation on flow operators

fopsdev/cerebral,christianalfoni/cerebral,yusufsafak/cerebral,bdjnk/cerebral,FWeinb/cerebral,fopsdev/cerebral,idream3/cerebral,idream3/cerebral,cerebral/cerebral,garth/cerebral,garth/cerebral,christianalfoni/cerebral,FWeinb/cerebral,yusufsafak/cerebral,bdjnk/cerebral,cerebral/cerebral