[build doc] for v2.7.1 & v2.6.2
_The documentation is not available anymore as the PR was closed or merged._ doc versions are built https://huggingface.co/docs/datasets/index
Do NOT merge. Using this PR to build docs for [v2.7.1](https://github.com/huggingface/datasets/pull/5291/commits/f4914af20700f611b9331a9e3ba34743bbeff934) & [v2.6.2](https://github.com/huggingface/datasets/pull/5291/commits/025f85300a0874eeb90a20393c62f25ac0accaa0)