Fix grammar in the federation documentation

This removes an extra word.

Author: jmckulk

docs/content/architecture/high-availability/multi-cluster-kubernetes.md

@@ -16,7 +16,7 @@ coordinate changes, and provide resiliency for applications that have high
 uptime requirements.
 
 As of this writing, federation in Kubernetes is still in ongoing development
-area and is something we monitor with intense interest. As Kubernetes federation
+and is something we monitor with intense interest. As Kubernetes federation
 continues to mature, we wanted to provide a way to deploy PostgreSQL clusters
 managed by the [PostgreSQL Operator](https://www.crunchydata.com/developers/download-postgres/containers/postgres-operator)
 that can span multiple Kubernetes clusters. This can be accomplished with a