Misalignment between card tag validation and docs
MEMBER
(Note that the doc is aligned with the hub validation rules, and the "ground truth" is the hub validation rules given that they apply to all datasets, not just the canonical ones)
2022-08-11T14:46:34Z
https://github.com/huggingface/datasets/issues/4829#issuecomment-1212088646
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COLLABORATOR
Instead of our own implementation, we now use `huggingface_hub`'s `DatasetCardData`, which has the correct type hint, so I think we can close this issue.
2023-07-21T15:38:02Z
https://github.com/huggingface/datasets/issues/4829#issuecomment-1645776256
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## Describe the bug
As pointed out in other issue: https://github.com/huggingface/datasets/pull/4827#discussion_r943536284
the validation of the dataset card tags is not aligned with its documentation: e.g.
- implementation: `license: List[str]`
- docs: `license: Union[str, List[str]]`

They should be aligned.

CC: @julien-c 
