message: Loop: fixed typo in error message
diff: @@ -484,7 +484,7 @@ def _loop_process_state(value: type, in_state: list, out_state: list,
  "loop_process_state(): one of the supplied loop state variables "
  "of type %s is attached to the AD graph (i.e., grad_enabled(..) "
  "is true). However, propagating derivatives through multiple "
  - "iterations of a recorded loop is not supported loop (and never "
  + "iterations of a recorded loop is not supported (and never "
  "will be). Please see the documentation on differentiating loops "
  "for details and suggested alternatives." % t.__name__)
  