message: Add warning for gcs_config_ops
diff: @@ -53,6 +53,12 @@ class BlockCacheParams(object):
  class ConfigureGcsHook(training.SessionRunHook):
  """ConfigureGcsHook configures GCS when used with Estimator/TPUEstimator.
  + Warning: GCS `credentials` may be transmitted over the network unencrypted.
  + Please ensure that the network is trusted before using this function. For
  + users running code entirely within Google Cloud, your data is protected by
  + encryption in between data centers. For more information, please take a look
  + at https://cloud.google.com/security/encryption-in-transit/.
  +
  Example:
  ```
  @@ -135,6 +141,12 @@ class ConfigureGcsHook(training.SessionRunHook):
  def configure_gcs(session, credentials=None, block_cache=None, device=None):
  """Configures the GCS file system for a given a session.
  + Warning: GCS `credentials` may be transmitted over the network unencrypted.
  + Please ensure that the network is trusted before using this function. For
  + users running code entirely within Google Cloud, your data is protected by
  + encryption in between data centers. For more information, please take a look
  + at https://cloud.google.com/security/encryption-in-transit/.
  +
  Args:
  session: A `tf.Session` session that should be used to configure the GCS
  file system.
  