message: Update Programmer's Guide link.
diff: @@ -23,7 +23,7 @@ For more advanced users:
  * The @{$low_level_intro$Low Level Introduction} demonstrates how to use
  TensorFlow outside of the Estimator framework, for debugging and
  experimentation.
  - * The @{$programmers_guide$Programmer's Guide} details major
  + * The @{$guide$Programmer's Guide} details major
  TensorFlow components.
  * The @{$tutorials$Tutorials} provide walkthroughs of a variety of
  TensorFlow models.
  