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

Some missing words; some odd word choices.
S
Scott Noyes committed
ee8e7c2fa950f88ba2c33035bea7aed7aaf0cb77
Parent: 92ceb1c
Committed by GitHub <noreply@github.com> on 5/6/2021, 9:52:46 PM