Fix example pillar in readme

Change-Id: I101a4891c7db077d7ee68440f7cc8d7ec5217b8c
diff --git a/README.rst b/README.rst
index cfe9182..8817d0a 100644
--- a/README.rst
+++ b/README.rst
@@ -89,7 +89,7 @@
     heat:
       server:
         ....
-        server.auth_encryption_key: "KeyToEncrypt-hasToBeExact32Chars"
+        auth_encryption_key: "KeyToEncrypt-hasToBeExact32Chars"
         ....
 
 Enable CORS parameters: