Document librispeech configs
CONTRIBUTOR
I think the main purpose of #4179 was how to be able to load both configs into one, so should we maybe add this part of the code: https://github.com/huggingface/datasets/issues/4179#issuecomment-1102383717 

to the doc? 

Actually @lhoestq would this work given that they have different split names: https://huggingface.co/datasets/librispeech_asr#data-splits ? 
2022-04-19T14:33:32Z
https://github.com/huggingface/datasets/pull/4183#issuecomment-1102731363
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2022-04-19T14:34:27Z
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NONE
This doc extension does not explain why I can't simply load the whole dataset. Or what workaround I need to get the whole dataset, which is what people usually want for Librispeech.
2022-04-19T14:35:55Z
https://github.com/huggingface/datasets/pull/4183#issuecomment-1102734022
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_The documentation is not available anymore as the PR was closed or merged._
2022-04-19T14:37:24Z
https://github.com/huggingface/datasets/pull/4183#issuecomment-1102735689
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2022-04-19T15:21:36Z
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CONTRIBUTOR
@lhoestq, I can add a `"all"` config to Librispeech have the datasets already cached somewhere 
2022-04-19T14:50:55Z
https://github.com/huggingface/datasets/pull/4183#issuecomment-1102750720
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MEMBER
I'm closing this PR then, feel free to continue the discussion in https://github.com/huggingface/datasets/issues/4179

2022-04-19T15:15:20Z
https://github.com/huggingface/datasets/pull/4183#issuecomment-1102777547
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Added an example of how to load one config or the other