Fix precommit config examples

[anneschuth]

Please check if the PR fulfills these requirements

• [x] The commit message follows our guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features) see docs/README.md

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Docs update

Does this PR introduce a breaking change? (What changes might users need to make due to this PR?) No