message: Fix pip install examples to match text: Use pip and point to Py2 packages
diff: @@ -118,8 +118,8 @@ Take the following steps to install TensorFlow with Virtualenv:
  Python 2.7, the command to install
  TensorFlow in the active Virtualenv is as follows:
  - <pre> $ <b>pip3 install --upgrade \
  - https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.6.0rc1-py3-none-any.whl</b></pre>
  + <pre> $ <b>pip install --upgrade \
  + https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.6.0rc1-py2-none-any.whl</b></pre>
  If you encounter installation problems, see
  [Common Installation Problems](#common-installation-problems).
  @@ -241,8 +241,8 @@ take the following steps:
  you are installing TensorFlow for Mac OS and Python 2.7
  issue the following command:
  - <pre> $ <b>sudo pip3 install --upgrade \
  - https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.6.0rc1-py3-none-any.whl</b> </pre>
  + <pre> $ <b>sudo pip install --upgrade \
  + https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.6.0rc1-py2-none-any.whl</b> </pre>
  If the preceding command fails, see
  [installation problems](#common-installation-problems).
  