Fix typo in user guide

[Viicos]

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• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
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• Tests have been included and/or updated, as appropriate
• Docstrings have been included and/or updated, as appropriate
• Standalone docs have been updated accordingly

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poetry run poe lint

[tombh]

Thanks, just need to update the commit message to docs: fix typo in user guide