title: ModuleNotFoundError: No module named 'tensorflow_docs' when creating TensorFlow docs
body: <p>I'm trying to follow the <a href="https://www.tensorflow.org/community/contribute/documentation" rel="noreferrer">contribution guide</a> for documentation. The required steps are:</p>
  
  <pre><code>git clone https://github.com/tensorflow/tensorflow tensorflow
  cd tensorflow/tensorflow/tools/docs 
  pip install tensorflow==2.0.0-alpha0 
  python generate2.py --output_dir=/tmp/out
  </code></pre>
  
  <p>But the last command gives me:</p>
  
  <blockquote>
    <p>Traceback (most recent call last):   File "generate2.py", line 36, in
    
        from tensorflow_docs.api_generator import doc_controls ModuleNotFoundError: No module named 'tensorflow_docs'</p>
  </blockquote>
  
  <p>This is in line 36 of <code>generate2.py</code>:</p>
  
  <pre><code>from tensorflow_docs.api_generator import doc_controls
  </code></pre>
  
  <p>I haven't found a pip package containing <code>tensorflow_docs</code>. Any ideas?</p>