Modify levels of some logging messages
COLLABORATOR
I've addressed this as part of #6019, so feel free to close this PR. 
2023-07-12T18:17:39Z
https://github.com/huggingface/datasets/pull/5934#issuecomment-1633001666
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2023-07-12T18:17:39Z
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CONTRIBUTOR
Thanks !
2023-07-12T18:21:02Z
https://github.com/huggingface/datasets/pull/5934#issuecomment-1633005976
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2023-07-12T18:21:02Z
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Some warning messages didn't quite sound like warnings so I modified their logging levels to info.