Edoc license header

Author: kvakvs

lib/eunit/doc/overview.edoc

@@ -1,6 +1,28 @@
 
 			-*- html -*-
 
+<!--
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+SPDX-License-Identifier: Apache-2.0
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+Copyright Ericsson AB 2000-2025. All Rights Reserved.
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+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+    http://www.apache.org/licenses/LICENSE-2.0
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+
 	EUnit overview page
 
 @title EUnit - a Lightweight Unit Testing Framework for Erlang