Filling in descriptions on settings

[john-science]

What is the change?

Filling in the description field on some Settings.

Why is the change being made?

We want to make descriptions mandatory on settings soon. And in the past I forgot to fill in the settings that are defined for unit test purposes.

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify any new/changed code.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes have been updated if necessary.
• The documentation is still up-to-date in the doc folder.
• The dependencies are still up-to-date in pyproject.toml.