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Update build bot update instructions (#20301)

`run_recipe.py` has been removed and waterfall is deprecated...
L
liyuqian committed
0630518b1b33d3f9a57f86c9bc6ab3a119fe2962
Parent: 4de692a
Committed by GitHub <noreply@github.com> on 8/7/2018, 6:49:04 PM