Fix typo
Fix a small typo in the README.
@@ -167,7 +167,7 @@ or modifying PostgreSQL databases deployed within the Kube cluster.
image::docs/operator-diagram.png?raw=true[]
-The operator funtionality runs in a Pod deployed to your
+The operator functionality runs in a Pod deployed to your
Kubernetes cluster. The *postgres-operator* Docker container
is available on link:https://hub.docker.com/r/crunchydata/postgres-operator/[Dockerhub].
