[docs] make dummy data creation optional
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The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3894). All of your documentation changes will be reflected on that endpoint.
2022-03-11T16:27:56Z
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The dev doc build rendering doesn't seem to be updated with my last commit for some reason
2022-03-11T17:20:44Z
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Merging it anyway since I'd like to share this page with users 🙃 
2022-03-11T17:27:48Z
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Related to #3507 : dummy data for datasets created on the Hugging Face Hub are optional.

We can discuss later to make them optional for datasets in this repository as well