message: Update tf.map_fn to specify that at least one tensor must be present
  Typo fix
diff: @@ -267,7 +267,7 @@ def map_fn(fn,
  elems: A tensor or (possibly nested) sequence of tensors, each of which will
  be unstacked along their first dimension. `fn` will be applied to the
  nested sequence of the resulting slices. `elems` may include ragged and
  - sparse tensors.
  + sparse tensors. `elems` must consist of at least one tensor.
  dtype: Deprecated: Equivalent to `fn_output_signature`.
  parallel_iterations: (optional) The number of iterations allowed to run in
  parallel. When graph building, the default value is 10. While executing
  @@ -296,7 +296,7 @@ def map_fn(fn,
  TypeError: if `fn` is not callable or the structure of the output of
  `fn` and `fn_output_signature` do not match.
  ValueError: if the lengths of the output of `fn` and `fn_output_signature`
  - do not match.
  + do not match, or if the `elems` does not contain any tensor.
  Examples:
  