docs(kitex): add explicit build and start commands for item service (#1323)

Author: XinyiWang0204

content/en/docs/kitex/Getting started/tutorial.md

@@ -595,7 +595,14 @@ func main() {
 
 Since the stock service is running on port 8890, we specify that port when creating the client.
 
-With this, the item service code is complete. Recompile and launch the item service as mentioned earlier. If you see the following output, it means the service is running successfully:
+At this point, the item service code is complete. Recompile and start the item service with the following commands:
+
+```bash
+sh build.sh
+sh output/bootstrap.sh
+```
+
+If you see the following output, it means the service is running successfully:
 
 ```
 2024/01/21 00:18:29.522546 server.go:83: [Info] KITEX: server listen at addr=[::]:8888

content/zh/docs/kitex/Getting started/tutorial.md

@@ -598,7 +598,14 @@ func main() {
 
 由于库存服务跑在 8890 端口，所以我们指定 8890 端口创建客户端。
 
-至此，商品服务代码编写完整，参照上文重新编译启动商品服务，看到如下输出代表运行成功：
+至此，商品服务代码编写完整，参照上文重新编译并启动商品服务，具体命令如下：
+
+```bash
+sh build.sh
+sh output/bootstrap.sh
+```
+
+看到如下输出代表运行成功：
 
 ```
 2024/01/21 00:18:29.522546 server.go:83: [Info] KITEX: server listen at addr=[::]:8888