Readthedocs not generating properly

### Description
Problem with generating docs in readthedocs. Works locally and on github.
The problem seems to be the empty "..code-block::" directive.

```
/home/docs/checkouts/readthedocs.org/user_builds/eiffellib/checkouts/stable/docs/examples.rst:10: WARNING: Error in "code-block" directive:
1 argument(s) required, 0 supplied.

.. code-block::

# From https://hub.docker.com/_/rabbitmq
docker run -d --hostname my-rabbit --name some-rabbit -p 8080:15672 -p 5672:5672 rabbitmq:3-management
../README.rst:40: WARNING: Error in "code-block" directive:
1 argument(s) required, 0 supplied.

.. code-block::

# From https://hub.docker.com/_/rabbitmq
docker run -d --hostname my-rabbit --name some-rabbit -p 8080:15672 -p 5672:5672 rabbitmq:3-management
looking for now-outdated files... none found
```

### Motivation
Readthedocs documentation should always work.

### Exemplification

### Benefits
Working documentation

### Possible Drawbacks
none

Commencez par docs/examples.rst à la ligne 10 et README.rst à la ligne 40, puis reproduisez le build de la documentation de Read the Docs afin d’inspecter les avertissements code-block. Vérifiez que les directives aux deux emplacements respectent la syntaxe documentée, et considérez le travail comme terminé lorsque le build se termine sans ces avertissements.

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