Documentation needed: Errors in production docker install

[HarvsG]

1. https://github.com/mattermost/docs/blob/master/source/install/prod-docker.rst#L73-L77
   This turorial point is inccorect docker-compose.yml no longer contains dockerfile: Dockerfile-enterprise
2. The tutorial contains no advise to edit the MM_PASSWORD=mmuser_password.
   Is this not insecure?
3. The linked TLS tutorial links to the repo README.md tutorial which is sparse, should it not link to the docs TLS tutorial instead?

[justinegeffen]

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