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Adjust defaults in docs to match new defaults in code. (#34664)

(and fix grammar)

See: https://github.com/flutter/flutter/pull/21826
J
Jim Graham committed
e6f896e3366a5290f0c1740d6a112ebb26ef06b9
Parent: b15b5b9
Committed by GitHub <noreply@github.com> on 6/19/2019, 7:55:44 PM