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Fixed minor typos and grammar mistakes in README and CONTRIBUTING (#134282)

* changed minor typos, little grammar mistakes

* fixed minor grammar mistakes in CONTRIBUTING
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Eric Cheng committed
722cbe1910f9d6572fe0ce30c22220a16f1f3c72
Parent: 333a215
Committed by GitHub <[email protected]> on 11/18/2021, 1:34:57 AM