message: Fix the index to match the left nav.
diff: @@ -5,6 +5,7 @@ works. The units are as follows:
  ## High Level APIs
  + * @{$programmers_guide/eager}, which is the easiest way to use tensorflow.
  * @{$programmers_guide/estimators}, which introduces a high-level
  TensorFlow API that greatly simplifies ML programming.
  * @{$programmers_guide/datasets}, which explains how to
  