wrong docker launch command in docs

[chris-aeviator]

The documentation (https://doc.wallabag.org/en/admin/installation/installation.html#command-to-launch-container) states docker pull as the command to launch wallabag. However, this command will never launch a container but only pull the image from docker hub.

[j0k3r]

Feel free to submit a PR to https://github.com/wallabag/doc