[3.10] Clean up comma usage in Doc/library/functions.rst (GH-27083)

[miss-islington]

(cherry picked from commit 1e651c6)

Co-authored-by: α∂мιηιχтяαтσя sadiqherritage@gmail.com

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[miss-islington]

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[miss-islington]

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[miss-islington]

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[miss-islington]

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