message: DOC: Resolve errors in Ubuntu Sanity checks
diff: @@ -104,7 +104,8 @@ def elu(x, alpha=1.0):
  >>> from tensorflow.keras import models, layers
  >>> model = models.Sequential()
  - >>> model.add(layers.Conv2D(32, (3, 3), activation='elu', input_shape=(28, 28, 1)))
  + >>> model.add(layers.Conv2D(32, (3, 3), activation='elu',
  + ... input_shape=(28, 28, 1)))
  >>> model.add(layers.MaxPooling2D((2, 2)))
  >>> model.add(layers.Conv2D(64, (3, 3), activation='elu'))
  >>> model.add(layers.MaxPooling2D((2, 2)))
  @@ -124,8 +125,8 @@ def elu(x, alpha=1.0):
  Reference:
  - [Fast and Accurate Deep Network Learning by Exponential Linear Units (ELUs)
  - (Clevert et al, 2016)](https://arxiv.org/abs/1511.07289)
  + [Fast and Accurate Deep Network Learning by Exponential Linear Units
  + (ELUs) (Clevert et al, 2016)](https://arxiv.org/abs/1511.07289)
  """
  return K.elu(x, alpha)
  