clustergroup usage update in docs

### Type of issue

Outdated article

### Description

On the site - https://validatedpatterns.io/learn/clustergroup-in-values-files/ - we need to update the clusterGroup.application examples to reflect adding a remote helm chart. 

### Page URL

https://validatedpatterns.io/learn/clustergroup-in-values-files/ 

### Content source URL

content/learn/clustergroup-in-values-files.adoc