Update the N Preview docs now that Studio 2.1 is stable. bug: 28342771
am: 96e6abb

* commit '96e6abb248938118fede112304ef80b3b9f70084':
  Update the N Preview docs now that Studio 2.1 is stable. bug: 28342771

Change-Id: If270f5a042c29b62fcb0834e153277ea3c1619ee