[issue39199] Improve the AST documentation

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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keywords: +patch
pull_requests: +17239
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17812

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39199>
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