fix typo in rename_column error message
{'login': 'hunterlang', 'id': 680821, 'node_id': 'MDQ6VXNlcjY4MDgyMQ==', 'avatar_url': 'https://avatars.githubusercontent.com/u/680821?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/hunterlang', 'html_url': 'https://github.com/hunterlang', 'followers_url': 'https://api.github.com/users/hunterlang/followers', 'following_url': 'https://api.github.com/users/hunterlang/following{/other_user}', 'gists_url': 'https://api.github.com/users/hunterlang/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/hunterlang/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/hunterlang/subscriptions', 'organizations_url': 'https://api.github.com/users/hunterlang/orgs', 'repos_url': 'https://api.github.com/users/hunterlang/repos', 'events_url': 'https://api.github.com/users/hunterlang/events{/privacy}', 'received_events_url': 'https://api.github.com/users/hunterlang/received_events', 'type': 'User', 'site_admin': False}
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['The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_4095). All of your documentation changes will be reflected on that endpoint.']
{'url': 'https://api.github.com/repos/huggingface/datasets/pulls/4095', 'html_url': 'https://github.com/huggingface/datasets/pull/4095', 'diff_url': 'https://github.com/huggingface/datasets/pull/4095.diff', 'patch_url': 'https://github.com/huggingface/datasets/pull/4095.patch', 'merged_at': datetime.datetime(2022, 4, 5, 8, 45, 53)}
I feel bad submitting such a tiny change as a PR but it confused me today 😄 
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