Docs feedback: Add helm3/k8s 1.16+ restrictions
### Problem to solve Please add to https://docs.gitlab.com/charts/ that the chart currently does not support 1.16+ kubernetes, or Helm3. I just wasted 3 hours trying to figure out what I was missing. ### Proposal Please add to https://docs.gitlab.com/charts/ that the chart currently does not support 1.16+ kubernetes, or Helm3. I just wasted 3 hours trying to figure out what I was missing. ### Who can address the issue ### Other links/references <!-- E.g. related GitLab issues/MRs -->
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