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

* commit '6049306d8c0f88f78dbc097bfcc971b095c6a9a3':
  Pass -yaml to ds builds to generate _book.yaml version of reference TOC.

Change-Id: I6b6a65147254b0d2ba5ec6aa52429819ddca9b77