Update the copyright header of step-90.

diff --git a/examples/step-90/step-90.cc b/examples/step-90/step-90.cc
index f97e9c91b38d40ea3055482ecc7a3d49df614310..1b866fc4bf747dc9bc00f7e692fe410afeae291d 100644 (file)
--- a/examples/step-90/step-90.cc
+++ b/examples/step-90/step-90.cc
@@ -1,17 +1,17 @@
-/* ---------------------------------------------------------------------
+/* ------------------------------------------------------------------------
  *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  * Copyright (C) 2024 by the deal.II authors
  *
  * This file is part of the deal.II library.
  *
- * The deal.II library is free software; you can use it, redistribute
- * it, and/or modify it under the terms of the GNU Lesser General
- * Public License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- * The full text of the license can be found in the file LICENSE.md at
- * the top level directory of deal.II.
+ * Part of the source code is dual licensed under Apache-2.0 WITH
+ * LLVM-exception OR LGPL-2.1-or-later. Detailed license information
+ * governing the source code and code contributions can be found in
+ * LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
+ *
+ * ------------------------------------------------------------------------
  *
- * ---------------------------------------------------------------------
  * This program was contributed by Vladimir Yushutin and Timo Heister, Clemson
  * University, 2023.
  */