Fix missing tags in dataset cards
_The documentation is not available anymore as the PR was closed or merged._
Fix missing tags in dataset cards:
- coqa
- hyperpartisan_news_detection
- opinosis
- scientific_papers
- scifact
- search_qa
- wiki_qa
- wiki_split
- wikisql

This PR partially fixes the missing tags in dataset cards. Subsequent PRs will follow to complete this task.

Related to:
- #4833
- #4891
- #4896
- #4908
- #4921