[issue43928] Fix the typo in documentation

[Terry J. Reedy]

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

Merge conflict in 3.9. Skipping backports.

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resolution: not a bug -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.10 -Python 3.8

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<https://bugs.python.org/issue43928>
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