message: Fix a typo in estimators.md
  A small typo `similarily` -> `similarly`
diff: @@ -187,7 +187,7 @@ est_inception_v3.train(input_fn=train_input_fn, steps=2000)
  Note that the names of feature columns and labels of a keras estimator come from
  the corresponding compiled keras model. For example, the input key names for
  @{$get_started/input_fn} in above `est_inception_v3` estimator can be obtained
  -from `keras_inception_v3.input_names`, and similarily, the predicted output
  +from `keras_inception_v3.input_names`, and similarly, the predicted output
  names can be obtained from `keras_inception_v3.output_names`.
  For more details, please refer to the documentation for
  