Merge "Pass -yaml to ds builds to generate _book.yaml version of reference TOC." into mnc-mr-docs
am: 5d8d511264

* commit '5d8d51126442d16c7237711f0f06da3a58e221f7':
  Pass -yaml to ds builds to generate _book.yaml version of reference TOC.

Change-Id: I242cc78db46926b295456384d0e6b487cb717bcb