message: Clarify docs for `tf.train.init_from_checkpoint`
  Fixes
diff: @@ -103,7 +103,10 @@ def list_variables(ckpt_dir_or_file):
  @tf_export("train.init_from_checkpoint")
  def init_from_checkpoint(ckpt_dir_or_file, assignment_map):
  - """Initializes current variables with tensors loaded from given checkpoint.
  + """Replaces `tf.Variable` initializers so they load from a checkpoint file.
  +
  + Values are not loaded immediately, but when the initializer is run
  + (typically by running a `tf.global_variables_initializer` op).
  Note: This overrides default initialization ops of specified variables and
  redefines dtype.
  