quantity_support call in 06-units_and_quantities.md

[martinherrerias]

I'd not used the library before, but it seems you need a call to quantity_support(), either on its own or on a context manager

[github-actions]

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⏱️ Updated at 2025-05-14 12:24:27 +0000

[Scottan]

@douglowe @SJaffa Please can this get merged? It tripped us up when giving the course on Tuesday