docs: Squared ReLU paper fix

[casinca]

What does this PR do?

It wasn't a typo but HF papers can't be indexed with specific versioning in the url, only digits and dot:
✖ Invalid string: must match pattern /^\d{4}\.\d{4,5}$/ → at arxivId
therefore the HF link to the paper was returning a 404 error. ArXiv always return the latest version when a v isn't specified.

I also indexed the paper on HF to make sure the URL works.

Edit: I checked with a regex search to see if there were other papers with versioning in the URL and also updated them.

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hi 👋@stevhliu

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: bit, clvp

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https://huggingface.co/spaces/transformers-community/circle-ci-viz?pr=42931&sha=b98317

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[stevhliu]

Nice catch, thanks for fixing the links!