[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?

Commencez par les instructions de publication en production liées dans l’issue et par la configuration de `/server`, puis reproduisez les commandes `npx apollo service:check` et `service:push` en utilisant `.env` et `ENGINE_API_KEY`. Le travail est terminé lorsque le processus de publication du schéma documenté dans le tutoriel fonctionne ou que les instructions expliquent clairement les paramètres et la configuration requis.

Rédigé par le modèle d'indexation à partir du texte de l'issue.