Create unique labels for "Service Design" pages and updated reference
Issue-ID: DOC-468

Signed-off-by: andreasgeissler <andreas-geissler@telekom.de>
Change-Id: I879dbd67a51f9508642d81bb17412193764fb9ce
diff --git a/docs/guides/onap-user/design/pre-onboarding/index.rst b/docs/guides/onap-user/design/pre-onboarding/index.rst
index 155ec56..7a09f0d 100644
--- a/docs/guides/onap-user/design/pre-onboarding/index.rst
+++ b/docs/guides/onap-user/design/pre-onboarding/index.rst
@@ -2,6 +2,8 @@
 .. International License. http://creativecommons.org/licenses/by/4.0
 .. Copyright 2019 ONAP Contributors. All rights reserved.
 
+.. _doc_guide_user_des_pre-onb:
+
 Pre-Onboarding
 ==============