Revise copyright and licensing terms in index.adoc for 3.8.0-rc.1

Updated copyright and licensing information in the document to match current situation with disclaimer on potential changes for the final release.

Author: pmai

content/index.adoc

@@ -5,8 +5,9 @@ include::{root-path}_config.adoc[]
 [IMPORTANT]
 .Disclaimer
 ====
-This document is the copyrighted property of ASAM e.V.
-Any use is limited to the scope described in the https://www.asam.net/license[license terms].
+This document is the copyrighted property of its respective copyright holders.
+Any use is limited to the scope described in the respective license terms: https://raw.githubusercontent.com/OpenSimulationInterface/open-simulation-interface/refs/heads/master/LICENSE[OSI LICENSE] and https://raw.githubusercontent.com/OpenSimulationInterface/osi-documentation/refs/heads/master/LICENSE[OSI Documentation LICENSE]
+Note that the set of licenses this release will be published under for the official release is still under discussion.
 ====
 
 ifndef::use-antora-rules[]