Wrong service name in the generated graphql pb file

The service name in the Go example should be `dfuse.graphql.v1.GraphQL` instead of `dfuse.eosio.v1.GraphQL`

See [this](https://github.com/dfuse-io/docs/blob/master/quickstarts/go/pb/graphql.pb.go#L307) line and [that](https://github.com/dfuse-io/docs/blob/master/quickstarts/go/pb/graphql.pb.go#L369) line. 