fix typo in notebook about Distribution Dimensionality

[nicrie]

What is this PR about?
This is a simple typo correction in the documentation. In the notebook about Distribution Dimensionality there seems to be a simple mix-up in the dimension order.

If you needed the Normal variables to have shape=(4, 3), you can transpose it after defining it.

To my understanding, it should be "shape=(3, 4)", as underlined by the fact the the following cell produces an output of shape (3, 4).

Checklist

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Major / Breaking Changes

None

New features

None

Bugfixes

None

Documentation

• fix typo in the Distribution Dimensionality notebook

Maintenance

None

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📚 Documentation preview 📚: https://pymc--7005.org.readthedocs.build/en/7005/

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[ricardoV94]

Thanks, good catch

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