Fix typo in README.rst

Change-Id: I1056868ed1238b1b694773187f9193d02db0bab6
diff --git a/README.rst b/README.rst
index da70b08..1f21e51 100644
--- a/README.rst
+++ b/README.rst
@@ -109,7 +109,7 @@
 
     nova:
       controller:
-        autidt:
+        audit:
           enabled: true
       ....
           filter_factory: 'keystonemiddleware.audit:filter_factory'