Fix number of templates in README.md of the single-master

Change-Id: I8c4ad7c30f90c8793f9cc8644c445025aeb71a2f
diff --git a/single-master/README.md b/single-master/README.md
index 216c910..3cd843e 100644
--- a/single-master/README.md
+++ b/single-master/README.md
@@ -5,7 +5,7 @@
 
 ## Architecture
 
-Two templates are provided in this example:
+Three templates are provided in this example:
 * `cf-cluster`: define the ECS cluster and the networking stack
 * `cf-service`: defined the service stack running Gerrit
 * `cf-dns-route`: defined the DNS routing for the service