add whitespace for clarity (#13580)

content/en/docs/concepts/configuration/assign-pod-node.md

@@ -256,6 +256,7 @@ be co-located in the same defined topology, eg., the same node.
 ##### Always co-located in the same node
 
 In a three node cluster, a web application has in-memory cache such as redis. We want the web-servers to be co-located with the cache as much as possible.
+
 Here is the yaml snippet of a simple redis deployment with three replicas and selector label `app=store`. The deployment has `PodAntiAffinity` configured to ensure the scheduler does not co-locate replicas on a single node.
 
 ```yaml