message: Fixing awkward wording.
diff: @@ -154,7 +154,7 @@ If the system outputs an error message instead of a greeting, see [Common
  installation problems](#common_installation_problems).
  There is also a helpful [script](https://gist.github.com/mrry/ee5dbcfdd045fa48a27d56664411d41c)
  -that helps with Windows TensorFlow installation issues.
  +for Windows TensorFlow installation issues.
  ## Common installation problems
  