Broken references in CSS Values and Units Module Level 5

[github-actions]

This pull request was automatically created by Strudy upon detecting errors in CSS Values and Units Module Level 5.

Please check that these errors were correctly detected, and that they have not already been reported in https://github.com/w3c/csswg-drafts.

If everything is OK, you can merge this pull request which will report the issue below to the repo, and update the underlying report file with a link to the said issue.

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Repo: https://github.com/w3c/csswg-drafts
Tracked: N/A
Title: Broken references in CSS Values and Units Module Level 5

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While crawling CSS Values and Units Module Level 5, the following links to other specifications were detected as pointing to non-existing anchors, which should be fixed:

• http://www.w3.org/TR/css-values-4/#acknowledgements

_{This issue was detected and reported semi-automatically by Strudy based on data collected in webref.}

[dontcallmedom]

it is broken, and boring to report; we should have a way to ignore such reports without blocking new useful reports in the future

[dontcallmedom]

the link is no longer broken