title: Fix description links in dataset cards
comments: _The documentation is not available anymore as the PR was closed or merged._ Non passing tests are due to other pre-existing errors in dataset cards: not related to this PR.
body: I noticed many links were not properly displayed (only text, no link) on the Hub because of wrong syntax, e.g.: https://huggingface.co/datasets/big_patent
  
  This PR fixes all description links in dataset cards.