message: Use r1.7 version.
diff: @@ -18,12 +18,10 @@ TensorFlow provides many APIs. The remainder of this section focuses on the
  Estimator API which provide scalable, high-performance models.
  To get started with Estimators begin by reading one of the following documents:
  - * @{$get_started/eager} is for machine learning beginners and uses
  - @{$programmers_guide/eager}.
  - * @{$get_started/get_started_for_beginners} is also for machine learning
  - beginners and uses @{$programmers_guide/graphs}.
  - * @{$get_started/premade_estimators} assumes some machine learning background
  - and uses an @{tf.estimator.Estimator$Estimator}.
  + * @{$get_started/get_started_for_beginners}, which is aimed at readers
  + new to machine learning.
  + * @{$get_started/premade_estimators}, which is aimed at readers who have
  + experience in machine learning.
  Then, read the following documents, which demonstrate the key features
  in the high-level APIs:
  