message: fix a minor issue for tf.split document
diff: @@ -1275,7 +1275,7 @@ unique_with_counts.__doc__ = gen_array_ops.unique_with_counts.__doc__
  def split(value, num_or_size_splits, axis=0, num=None, name="split"):
  """Splits a tensor into sub tensors.
  - If `num_or_size_splits` is an integer type, `num_split`, then splits `value`
  + If `num_or_size_splits` is an integer type, then splits `value`
  along dimension `axis` into `num_split` smaller tensors.
  Requires that `num_split` evenly divides `value.shape[axis]`.
  