message: Documentation fix for TensorShape.__getitem__
  RELNOTES: n/a
diff: @@ -606,8 +606,8 @@ class TensorShape(object):
  slice.
  Raises:
  - ValueError: If `key` is a slice, and any of its elements are negative, or
  - if `self` is completely unknown and the step is set.
  + ValueError: If `key` is a slice and `self` is completely unknown and
  + the step is set.
  """
  if self._dims is not None:
  if isinstance(key, slice):
  