message: docs(gan): fix tutorial link for ipythonnotebook
  Closes
diff: @@ -57,7 +57,7 @@ These include the following main pieces (explained in detail below).
  generative models.
  * [examples](https://github.com/tensorflow/models/tree/master/research/gan/)
  - and [tutorial](http://https://github.com/tensorflow/models/tree/master/research/gan/tutorial.ipynb): See examples of how to use TF-GAN
  + and [tutorial](https://github.com/tensorflow/models/tree/master/research/gan/tutorial.ipynb): See examples of how to use TF-GAN
  to make GAN training easier, or use the more complicated examples to
  jumpstart your own project. These include unconditional and conditional
  GANs, InfoGANs, adversarial losses on existing networks, and image-to-image
  