Update Wikipedia metadata
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3958). All of your documentation changes will be reflected on that endpoint.
2022-03-17T17:57:47Z
https://github.com/huggingface/datasets/pull/3958#issuecomment-1071157754
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2022-03-17T17:57:47Z
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Once this last PR validated, I can take care of the integration of all the wikipedia update branch into master, @lhoestq. 
2022-03-18T14:43:20Z
https://github.com/huggingface/datasets/pull/3958#issuecomment-1072478345
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2022-03-18T14:43:35Z
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This PR updates:
- dataset card
- metadata JSON