message: Grammatical error fixed
diff: @@ -13,7 +13,7 @@ works. The units are as follows:
  ## Low Level APIs
  * @{$programmers_guide/low_level_intro}, which introduces the
  - basics of how you can to use TensorFlow outside of the high Level APIs.
  + basics of how you can use TensorFlow outside of the high Level APIs.
  * @{$programmers_guide/tensors}, which explains how to create,
  manipulate, and access Tensors--the fundamental object in TensorFlow.
  * @{$programmers_guide/variables}, which details how
  