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Update pubspec template docs for module/plugin (#24081)

* Document module pubspec

* update doc on plugin template

* clarify language
D
Dan Field committed
9d53d7f848228ecd970d86724452be4cb866d6ff
Parent: f9374fe
Committed by GitHub <noreply@github.com> on 11/8/2018, 1:20:18 AM