Instructions for python flatten: change null into None

[branscha]

File: exercises/practice/flatten-array/.docs/instructions.md

In this exercise description the example uses "null" whereas in Python it should be "None".

[github-actions]

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[BethanyG]

Hi @branscha 👋🏽

Thanks for filing an issue. Unfortunately, the instructions for the flatten-array practice exercise are pulled from a cross programming language repo called problem specifications. They are not editable for the Python (or any) track.

While we could make an instruction append, I think that the difference between nil/null and None is fairly easily determined by most Pythonistas, and so making an append is unnecessary work.

However, should you want to suggest that the Python None to be added to the general exercise instructions, the place to do that would be problem specifications, after you open the issue for discussion in the Exercism forum.

Thanks for your understanding. 🙂