Merge "Pass -yaml to ds builds to generate _book.yaml version of reference TOC." into mnc-mr-docs am: 5d8d511264 am: 6049306d8c
am: c25a9b0104

* commit 'c25a9b0104802454487ee6c428f9f070d389c02f':
  Pass -yaml to ds builds to generate _book.yaml version of reference TOC.

Change-Id: Ib8ff6165cbcb1d3fb52611e9f5e61ac69a0083b6