Fix code examples indentation
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_3895). All of your documentation changes will be reflected on that endpoint. Still not rendered properly: https://moon-ci-docs.huggingface.co/docs/datasets/pr_3895/en/package_reference/main_classes#datasets.Dataset.align_labels_with_mapping My last commit should have fixed it, I don't know why the dev doc build is not showing my last changes Let me merge this and we can see on `master` how it renders, until the dev doc build is fixed
Some code examples are currently not rendered correctly. I think this is because they are over-indented

cc @mariosasko 