Add note for some functions and fix document error

Change-Id: Ide2500c393d2a135f343263dd8c3e3f0e644efe0
diff --git a/configuration/device-config.rst b/configuration/device-config.rst
index 1b635b8..cb7e23d 100644
--- a/configuration/device-config.rst
+++ b/configuration/device-config.rst
@@ -57,7 +57,7 @@
   device. It overrides the driver selected by ONOS automatically when the
   device connects.
 
-    - When using OpenvSwitch, set this to ``ovs-ofdpa``
+    - When using OpenvSwitch, set this to ``ofdpa-ovs``
 
     - When using hardware switches, set this to ``ofdpa3`` or eliminate
       ``driver`` entirely as the correct driver configuration will be set