message: Emphasis any `Estimator`
diff: @@ -38,8 +38,10 @@ Estimators automatically write the following to disk:
  uses to create visualizations.
  To specify the top-level directory in which the Estimator stores its
  -information, assign a value to the optional `model_dir` argument of any
  -Estimator's constructor. For example, the following code sets the `model_dir`
  +information, assign a value to the optional `model_dir` argument of *any*
  +`Estimator`'s constructor.
  +Taking `DNNClassifier` as an example,
  +the following code sets the `model_dir`
  argument to the `models/iris` directory:
  ```python
  