Update link in Master Release Notes

-Use reference instead of http URL to limnk to other readthedoc pages

Issue-ID: DOC-150

Change-Id: I840c305feabcefd3927e1fdd396e4c1a77a4ce16
Signed-off-by: Gildas Lanilis <gildas.lanilis@huawei.com>
diff --git a/docs/guides/onap-developer/settingup/fullonap.rst b/docs/guides/onap-developer/settingup/fullonap.rst
index 86fc31c..6863fd3 100644
--- a/docs/guides/onap-developer/settingup/fullonap.rst
+++ b/docs/guides/onap-developer/settingup/fullonap.rst
@@ -28,6 +28,8 @@
 
 The installation requires some manual tasks to setup the DCAE components.
 
+.. _demo-installing-running-onap-requirements:
+
 **Requirements**
 ================