[issue38975] Add direct anchors to regex syntax documentation

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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keywords: +patch
pull_requests: +16949
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17470

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38975>
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