docs: fix table width

[MichaelEischer]

What does this PR change? What problem does it solve?

Fix too wide tables in the docs.

Was the change previously discussed in an issue or on the forum?

Probably no.

Checklist

• [ ] I have added tests for all code changes.
• [x] I have added documentation for relevant changes (in the manual).
• [ ] There's a new file in changelog/unreleased/ that describes the changes for our users (see template).
• [x] I'm done! This pull request is ready for review.