fix tutorial config links

[pz-max]

Closes #436

Changes proposed in this Pull Request

Fix in the tutorial.rst the reference to the config.yaml.
I now avoid the line references and use only config objects e.g. start-at: cutout:
This should be more stable in long-term.

Here are the results:

Checklist

• I tested my contribution locally and it seems to work fine.
• Code and workflow changes are sufficiently documented.
• Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/configuration.rst and doc/tutorial.rst.
• A note for the release notes doc/release_notes.rst is amended in the format of previous release notes. --- Guess no release note required for this minor change

[pz-max]

ready to merge