Remove dummy data generation docs
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_The documentation is not available anymore as the PR was closed or merged._
2022-07-29T19:28:10Z
https://github.com/huggingface/datasets/pull/4771#issuecomment-1199879547
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2022-08-03T00:04:01Z
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This PR removes instructions to generate dummy data since that is no longer necessary for datasets that are uploaded to the Hub instead of our GitHub repo.

Close #4744