[issue38975] Add direct anchors to regex syntax documentation

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

¶ anchors are generated automatically for headers, but I don't know what the policy might be for items within section.  It might be useful to add some subsection headers within the Regular Expression Syntax section.

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nosy: +serhiy.storchaka, terry.reedy

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<https://bugs.python.org/issue38975>
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