[Docs] Issue when publishing schema

Hey there!
For some reason when trying to [publish the schema](https://www.apollographql.com/docs/tutorial/production.html#publish) I was getting this error:
```
✔ Loading Apollo Project
✖ Uploading service to Engine
→ No service found to link to Engine
Error: No service found to link to Engine
at Task.task (~/.npm/_npx/32532/lib/node_modules/apollo/lib/commands/service/push.js:17:31)
at Promise.resolve.then.then.skipped (~/.npm/_npx/32532/lib/node_modules/apollo/node_modules/listr/lib/task.js:167:30)
at
```

This is what I did, and didn't work:
- Had my `.env` file with the `ENGINE_API_KEY` set.
- Tried removing the `sevice:` prefix from the value of the variable
- Tried restarting the server
- Tried running `npx apollo service:check && npx apollo service:push` from the `/server` folder
- Double and tripled checked the API key

Finally I gave up and had to type the parameters directly on the `service:push` command.

Is this only my issue?

先从 issue 中链接的生产发布说明和 `/server` 设置开始，然后使用 `.env` 和 `ENGINE_API_KEY` 重现 `npx apollo service:check` 和 `service:push` 命令。完成标准是教程中记录的 schema 发布流程能够正常工作，或说明清楚所需的参数和配置。

由索引模型根据 Issue 内容生成。