message: fix typo in _InsertQuantOp docstring
diff: @@ -685,7 +685,7 @@ def _InsertQuantOp(context,
  [1; 2^bits - 1] or wide range [0; 2^bits - 1].
  producer_scope: The restriction of producer scope. If not None, the new op
  will be inserted only when the producer is in this scope.
  - consumer_scope: The restriction of producer scope. If not None, the new op
  + consumer_scope: The restriction of consumer scope. If not None, the new op
  will be inserted only when all the consumers are in this scope.
  Raises:
  ValueError: When producer operation is not directly connected to the
  