docs: Fix license/copyright text in file

Should have been included in b355341,
but was overlooked.

Author: jmgate

reverse_argparse/__init__.py

@@ -3,13 +3,13 @@
 
 Provide the :class:`ReverseArgumentParser` class and
 :func:`quote_arg_if_necessary` helper function.
+"""
 
-© 2024 National Technology & Engineering Solutions of Sandia, LLC
-(NTESS).  Under the terms of Contract DE-NA0003525 with NTESS, the U.S.
-Government retains certain rights in this software.
+# © 2024 National Technology & Engineering Solutions of Sandia, LLC
+# (NTESS).  Under the terms of Contract DE-NA0003525 with NTESS, the
+# U.S. Government retains certain rights in this software.
 
-SPDX-License-Identifier: BSD-3-Clause
-"""
+# SPDX-License-Identifier: BSD-3-Clause
 
 from .reverse_argparse import ReverseArgumentParser, quote_arg_if_necessary