message: Clarify how to run tf_upgrade_v2.
diff: @@ -7,7 +7,7 @@ Specifically: \
  ## Running the script from pip package
  -First, install TensorFlow pip package. See
  +First, install TensorFlow pip package*. See
  https://www.tensorflow.org/install/pip.
  Upgrade script can be run on a single Python file:
  @@ -27,6 +27,8 @@ tf_upgrade_v2 --intree coolcode --outtree coolcode-upgraded
  tf_upgrade_v2 --intree coolcode --outtree coolcode-upgraded --copyotherfiles False
  ```
  +*Note: `tf_upgrade_v2` is installed automatically as a script by the pip install
  +after TensorFlow 1.12.
  ## Report
  