Updating the redirect link at legacy RDS location

Author: rohennes

welcome/index.adoc

@@ -45,7 +45,7 @@ ifdef::openshift-telco[]
 ====
 The telco core and telco RAN DU reference design specifications (RDS) are no longer published at this location.
 
-For the latest version of the telco RDS, see link:https://docs.openshift.com/container-platform/4.15/telco_ref_design_specs/telco-ref-design-specs-overview.html[Telco core and RAN DU reference design specifications].
+For the latest version of the telco RDS, see link:https://docs.openshift.com/container-platform/{product-version}/scalability_and_performance/telco_ref_design_specs/telco-ref-design-specs-overview.html[Telco core and RAN DU reference design specifications].
 ====
 
 endif::[]