Fix header level in Audio docs
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2022-10-05T20:28:10Z
https://github.com/huggingface/datasets/pull/5078#issuecomment-1268937487
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2022-10-06T08:12:23Z
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Fixes header level so `Dataset features` is the doc title instead of `The Audio type`:

![Screen Shot 2022-10-05 at 1 22 02 PM](https://user-images.githubusercontent.com/59462357/194155840-eeb5d62f-f4eb-411e-b281-8494c5fffdce.png)