Revert back to 2.28.5
git revert v2.28.5..v2.28.6
git rebase to combine the resulting revert commits
This reverts commit 3a91dad9dceb484eea8b41f8941facafc4520021.
diff --git a/doxygen/input/doc_hashing.h b/doxygen/input/doc_hashing.h
index aff7dfa..aaa0c78 100644
--- a/doxygen/input/doc_hashing.h
+++ b/doxygen/input/doc_hashing.h
@@ -6,7 +6,19 @@
/*
*
* Copyright The Mbed TLS Contributors
- * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*/
/**