message: Fix typo in LinearModel() docstring
  adn -> and
diff: @@ -41,7 +41,7 @@ class LinearModel(tfe.Network):
  For those familiar with TensorFlow graphs, notice the absence of
  `tf.Session`. The `forward()` method here immediately executes and
  returns output values. The `loss()` method immediately compares the
  - output of `forward()` with the target adn returns the MSE loss value.
  + output of `forward()` with the target and returns the MSE loss value.
  The `fit()` performs gradient-descent training on the model's weights
  and bias.
  """
  