patching Kustomize monitoring installer (CrunchyData#228)

* patching Kustomize monitoring installer
* Update README.md

Author: benjaminjb

kustomize/monitoring/README.md

@@ -1,5 +1,10 @@
-To deploy monitoring,
+To deploy monitoring:
+
+> **_NOTE:_** For more detailed instructions on deploying, see the [documentation on installing Monitoring](https://access.crunchydata.com/documentation/postgres-operator/latest/installation/monitoring/kustomize).
 
 1. verify the namespace is correct in kustomization.yaml 
-2. If you are deploying in openshift, edit deploy*.yaml and comment out fsGroup line under securityContext
+2. If you are deploying in openshift, comment out the fsGroup line under securityContext in the following files:
+  - `alertmanager/deployment.yaml`
+  - `grafana/deployment.yaml`
+  - `prometheus/deployment.yaml`
 3. kubectl apply -k .