[issue40471] Grammar typo in issubclass docstring

[alexpovel]

alexpovel <python at alexpovel.de> added the comment:

Hi Rémi,

thank you very much for the hearty welcome.

Your explanations worked perfectly and the PR was created. `make regen-all` created new checksums as well, as intended.

I had already signed the CLA, and will now dive into the devguide!

Thanks again.

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<https://bugs.python.org/issue40471>
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