[issue45463] Document that # of identifiers allowed in global stmt is plural

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> patch review
title: Documentation inconsistency on the number of identifiers allowed in global stmt -> Document that # of identifiers allowed in global stmt is plural
versions: +Python 3.10, Python 3.11, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45463>
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