Added cert_manager_version var in kube.tf.example

Author: PCatinean

kube.tf.example

@@ -1013,6 +1013,9 @@ encryption:
 MTU: 1450
   EOT */
 
+  # If you want to use a specific cert-manager helm chart version, set it below; otherwise, leave them as-is for the latest versions.
+  # cert_manager_version = ""
+
   # Cert manager, all cert-manager helm values can be found at https://github.com/cert-manager/cert-manager/blob/master/deploy/charts/cert-manager/values.yaml
   # The following is an example, please note that the current indentation inside the EOT is important.
   # For cert-manager versions < v1.15.0, you need to set installCRDs: true instead of crds.enabled and crds.keep.