📒 Fix type/format confusions

[qgallouedec]

What does this PR do?

I realize that there are many instances of confusion between dataset type and format. this PR solves them.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Was this discussed/approved via a GitHub issue? Please add a link
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• Did you write any new necessary tests?

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