message: Add Raises in the docstring of tf.histogram_fixed_width
  This fix adds exception conditions for tf.histogram_fixed_width
  in the docstring.
  This fix fixes 29276.
diff: @@ -119,6 +119,11 @@ def histogram_fixed_width(values,
  Returns:
  A 1-D `Tensor` holding histogram of values.
  + Raises:
  + TypeError: If any unsupported dtype is provided.
  + tf.errors.InvalidArgumentError: If value_range does not
  + satisfy value_range[0] < value_range[1].
  +
  Examples:
  ```python
  