MeDAL dataset: Add further description and update download URL
{'login': 'xhluca', 'id': 21180505, 'node_id': 'MDQ6VXNlcjIxMTgwNTA1', 'avatar_url': 'https://avatars.githubusercontent.com/u/21180505?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/xhluca', 'html_url': 'https://github.com/xhluca', 'followers_url': 'https://api.github.com/users/xhluca/followers', 'following_url': 'https://api.github.com/users/xhluca/following{/other_user}', 'gists_url': 'https://api.github.com/users/xhluca/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/xhluca/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/xhluca/subscriptions', 'organizations_url': 'https://api.github.com/users/xhluca/orgs', 'repos_url': 'https://api.github.com/users/xhluca/repos', 'events_url': 'https://api.github.com/users/xhluca/events{/privacy}', 'received_events_url': 'https://api.github.com/users/xhluca/received_events', 'type': 'User', 'site_admin': False}
[]
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@lhoestq I'm a bit confused by the error message. I haven't touched the YAML code at all - do you have any insight on that? I just added the missing `pretty_name` tag in the YAML - sorry about that ;) Thanks! Seems like it did the trick since the tests are passing. Let me know if there's anything else I can do in this PR! It's all good thank you :)

merging !
Added more details in the following sections:
* Dataset Structure
* Data Instances
* Data Splits
* Source Data
* Annotations
* Discussions of Biases
* LIcensing Information
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