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Point to master API docs (#14292)

* Point to master API docs

I _think_ this is the right place, since people contributing and working on master might care about where the API docs are for master branch.

* Update CONTRIBUTING.md

update from review comment
S
Seth Ladd committed
d6dad95842b82694444c7965a13ece9ac9feda62
Parent: c9215e6
Committed by GitHub <noreply@github.com> on 1/27/2018, 12:34:08 AM