Merge "docs: Document test artifact preference setting b/24810371" into mnc-docs am: 53ae576  -s ours am: 0c615f4 am: bb93651
am: 2269a11

* commit '2269a11cc07e040afc6aed3d8c3f8f79c5dd835c':
  docs: Document test artifact preference setting b/24810371

Change-Id: I2f17096102a7acfee696367043b36f118f31ac89