code: func (p *printer) Method(method *descriptor.MethodDescriptorProto) {
  	p.MaybeLeadingComments(method)
  	p.Printf(
  		"rpc %s(%s) returns (%s) {};\n",
  		method.GetName(),
  		p.shorten(method.GetInputType()),
  		p.shorten(method.GetOutputType()),
  	)
  }
docs: // Method prints a service method definition.