fix typo in rpc service class
fix typo in rpc service class

ruby-protobuf/protobuf,film42/protobuf,quixoten/protobuf,quixoten/protobuf,film42/protobuf,lookout/protobuffy,localshred/protobuf,brianstien/protobuf,ruby-protobuf/protobuf,localshred/protobuf,zanker/protobuf,lookout/protobuffy,brianstien/protobuf,zanker/protobuf