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1. Sync sphinx dependency with global requirements. It caps python 2 since sphinx 2.0 no longer supports Python 2.7. 2. Remove unncessary "==" Change-Id: I6988ed388cc6543bc49e62172aa93f34fdca8e95
1. Sync sphinx dependency with global requirements. It caps python 2 since sphinx 2.0 no longer supports Python 2.7. 2. Remove unncessary "==" Change-Id: I6988ed388cc6543bc49e62172aa93f34fdca8e95