Fix typo in doc build yml
NONE
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3819). All of your documentation changes will be reflected on that endpoint.
2022-03-03T20:15:03Z
https://github.com/huggingface/datasets/pull/3819#issuecomment-1058443179
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2022-03-03T20:15:03Z
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