proxy_minion fix

Change-Id: I73a4a14734651f6483fae169a2290e9c5b377d76
diff --git a/README.rst b/README.rst
index 3c42d00..ee93fcf 100644
--- a/README.rst
+++ b/README.rst
@@ -219,7 +219,7 @@
 
     salt:
       minion:
-        proxy:
+        proxy_minion:
           master: localhost
           device:
             vsrx01.mydomain.local: