[VOL-3373] Updating voltha docs with califications and more links

Change-Id: If37468e130446164737467bec32c7fd28ed32320
diff --git a/overview/pod_physical.rst b/overview/pod_physical.rst
index 9fb7c01..8a35abe 100644
--- a/overview/pod_physical.rst
+++ b/overview/pod_physical.rst
@@ -26,6 +26,8 @@
 If you already have a ``radius`` server that you want to use, change the flag to ``WITH_RADIUS=n``
 and `configure ONOS accordingly <https://github.com/opencord/aaa>`_.
 
+For more information please check `kind-voltha page <kind-voltha/README.md>`_.
+
 TLDR;
 -----