docinfo: Fixing Copyright and license information section

The license listed in the Copyright and license information section does
not match the license in the LICENSE file. Let's fix this section.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>

docinfo.adoc

@@ -1,14 +1,13 @@
 == Document information
 
 === Copyright and license information
-This specification is licensed under the Creative Commons
-Attribution 4.0 International License (CC-BY 4.0). The full
-license text is available at
-https://creativecommons.org/licenses/by/4.0/.
+This specification is licensed under the Apache License, Version 2.0
+(Apache-2.0). The full license text is available at
+https://www.apache.org/licenses/LICENSE-2.0.
 
-Copyright 2022 by T-head Semiconductor
+Copyright 2022 T-Head Semiconductor Co., Ltd.
 
-Copyright 2022 by VRULL
+Copyright 2022 VRULL GmbH
 
 === Contributors