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Clean up comma usage in Doc/library/functions.rst (GH-27083) (#27243)

(cherry picked from commit 1e651c6adad8e4e772a15eaa9ee659b1283a96d9)

Co-authored-by: α∂мιηιχтяαтσя <sadiqherritage@gmail.com>
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Miss Islington (bot) committed
2d0492091e3fce73230b2e88949210c9f1eb194b
Parent: a272164
Committed by GitHub <noreply@github.com> on 7/19/2021, 4:38:56 PM