[issue41224] Document is_annotate() in symtable and update doc strings

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:


New changeset bc15cdbc6eb112cb72acf189769ecd539dd45652 by Andre Delfino in branch '3.8':
[3.8] bpo-41224: Add versionadded for Symbol.is_annotated (GH-23861). (GH-24016)
https://github.com/python/cpython/commit/bc15cdbc6eb112cb72acf189769ecd539dd45652


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