Update documentation

Issue-ID: NONRTRIC-769
Signed-off-by: elinuxhenrik <henrik.b.andersson@est.tech>
Change-Id: I2a1010ad786040967b5b5c77a7c5cbd0577ea977
diff --git a/docs/overview.rst b/docs/overview.rst
index 773b872..f0eef08 100644
--- a/docs/overview.rst
+++ b/docs/overview.rst
@@ -29,4 +29,4 @@
 
 * Implemented as a Java Spring Boot application.
 
-
+This product is a part of :doc:`NONRTRIC <nonrtric:index>`.