only one service expected

[GuoxinL]

Describe the bug
The document describes that multiple services can be defined in proto, but the error "only one service expected" is reported in actual use.

To Reproduce
Steps to reproduce the behavior, if applicable:

// 声明 proto 语法版本，固定值
syntax = "proto3";

// proto 包名
package greet;

// 生成 golang 代码后的包名
option go_package = "example/proto/greet";

// 定义结构体
message SendMessageReq{
  string message = 1;
}
message SendMessageResp{
  int32 status = 1;
}

message GetMessageReq{
  int32 id = 1;
}
message GetMessageResp{
  string message = 1;
}

// 定义 Greet 服务
service Greet {
  // 定义客户端流式 rpc
  rpc SendMessage(stream SendMessageReq) returns (SendMessageResp);
  // 定义服务端流式 rpc
  rpc GetMessage(GetMessageReq) returns (stream GetMessageResp);
  // 定义双向流式 rpc
  rpc PushMessage(stream SendMessageReq) returns (stream GetMessageResp);
}

// 定义 Message 服务
service Message {
  // 定义客户端流式 rpc
  rpc SendMessage(stream SendMessageReq) returns (SendMessageResp);
  // 定义服务端流式 rpc
  rpc GetMessage(GetMessageReq) returns (stream GetMessageResp);
  // 定义双向流式 rpc
  rpc PushMessage(stream SendMessageReq) returns (stream GetMessageResp);
}

1. The code is

   goctl rpc protoc ./proto/greet.proto --go_out=./test --go-grpc_out=./test --zrpc_out=./test

2. The error is

   only one service expected
   

Expected behavior
A clear and concise description of what you expected to happen.
You want to support multiple services to generate Protos

Screenshots
If applicable, add screenshots to help explain your problem.

Environments (please complete the following information):

• OS: [e.g. Linux]
• go-zero version [e.g. 1.2.1]
• goctl version [e.g. 1.2.1, optional]
  

More description
Add any other context about the problem here.

[chenquan]

Refer to the documentation：https://go-zero.dev/docs/tutorials/cli/rpc

[GuoxinL]

wow, thank you.