Add references to overview and installation files

Change-Id: I8e613ae7b17aae7f9532373baaa3db2ecf4f99cb
Issue-ID: DCAEGEN2-1504
Signed-off-by: Reshmasree <reshmasree.chamarthi2@wipro.com>
diff --git a/docs/sections/services/son-handler/index.rst b/docs/sections/services/son-handler/index.rst
index cd3bb46..5bc4fbd 100644
--- a/docs/sections/services/son-handler/index.rst
+++ b/docs/sections/services/son-handler/index.rst
@@ -20,7 +20,7 @@
 .. toctree::
     :maxdepth: 1
 
-    son_handler_ms
+    ./son_handler_overview.rst
 
 SON-Handler MS Installation Steps, Configurations, Troubleshooting Tips and Logging
 -----------------------------------------------------------------------------------
@@ -28,4 +28,5 @@
 .. toctree::
     :maxdepth: 1
 
-    son_handler_ms_addl
+    ./son_handler_installation.rst
+    ./son_handler_troubleshooting.rst