Reference policy/parent for latest doc

Point to new documentation.

Issue-ID: POLICY-1676
Change-Id: I1a3e9a7f1147885c8de72a725c8637a86cd5eb7c
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
(cherry picked from commit 6b6cb44dd9f60df943c31188ec68a25852c0200b)
diff --git a/docs/index.rst b/docs/index.rst
index ece0fd9..ba12cc5 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,7 +1,7 @@
 .. This work is licensed under a Creative Commons Attribution 4.0 International License.
 
-Policy Engine
--------------
+Policy Engine (Legacy)
+---------------------
 
 .. toctree::
    :maxdepth: 1