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Update flutter daemon docs (#18199)

* Document flutter run --machine at the bottom of the doc
* Be consistent with prefixes
D
Danny Tuppeny committed
b9392ed2202b7152f39131087c2c91c1217746c8
Parent: 09276be
Committed by GitHub <noreply@github.com> on 6/5/2018, 3:21:50 PM