fix missing variable names in docs
MEMBER
The problem came from `default: ` that is rendered differently and hides the parameter names. I changed `default: ...` to `defaults to ...`
2020-08-24T13:32:40Z
https://github.com/huggingface/datasets/pull/528#issuecomment-679128399
https://api.github.com/repos/huggingface/datasets/issues/528
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2020-08-24T13:32:40Z
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fix #524 