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Added note about design doc template. (#43658)

* Added note about design doc template.

* switched "our" to "flutter"

* updated link
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gaaclarke committed
56e3c0c6788baf4f639534ec744e8f42dcd64af1
Parent: e25cd84
Committed by GitHub <noreply@github.com> on 10/28/2019, 10:58:24 PM