Docs: Code block line length

[JacobCoffee]

Summary

For documentation, and only documentation, if you have an overly long code block it enters scrollable window.

We should set blacken-docs configuration (and eventually ruff when astral-sh/ruff#8237 happens) to line lengths somewhere on the lower end (maybe 80?); this goes together with manually ensuring .. code-block:: directives are not overly long

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