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Fix minor grammar problems in dataclasses documentation (GH-25948) (GH-25958)

Some missing words; some odd word choices.
(cherry picked from commit ee8e7c2fa950f88ba2c33035bea7aed7aaf0cb77)

Co-authored-by: Scott Noyes <snoyes@gmail.com>

Co-authored-by: Scott Noyes <snoyes@gmail.com>
M
Miss Islington (bot) committed
ba5076f34ba3ad5252e29b55727c5c95576e7310
Parent: fbefdaf
Committed by GitHub <noreply@github.com> on 5/6/2021, 9:54:32 PM