fix: formatting in notebook.md

[pirnerjonas]

Description

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Type of change

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

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YOUR_ANSWER

Any specific deployment considerations

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Docs

• [ x] Docs updated? What were the changes: fixed formatting error

[CLAassistant]

All committers have signed the CLA.

[onuralpszr]

@pirnerjonas please accept CLA and I will merge

[pirnerjonas]

Thanks for the hint @onuralpszr. Accepted CLA