Tidy up license metadata for google_wellformed_query, newspop, sick

[leondz]

Amend three licenses on datasets to fit naming convention (lower case, cc licenses include sub-version number). I think that's it - everything else on datasets looks great & super-searchable now!

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[albertvillanova]

Thanks for the fixes, @leondz.

In order to have all tests green, could you please add these lines (between triple backticks) to file "datasets/google_wellformed_query/README.md", under the "Data Instances" section?

{'rating': 0.2, 'content': 'The European Union includes how many ?'}

[albertvillanova]

Thanks.

[leondz]

& thank you!