Broken references in User Timing Level 3

[github-actions]

This pull request was automatically created by Strudy upon detecting errors in User Timing Level 3.

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

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/user-timing'
Tracked: N/A
Title: Broken references in User Timing Level 3

While crawling User Timing Level 3, the following links to other specifications were detected as pointing to non-existing anchors:

• https://www.w3.org/TR/navigation-timing/#performancetiming

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

[dontcallmedom]

false positive due to discrepancy between currentSpecificaiton.shortname and what TR/${shortname} returns