Add missing helm snipped to locked issue

[99hops]

Please add this in the end of this issue @adleong as the issue is locked and I belive it's a super important for other to use this solution (just verified) with helm (argo) but the thread is locked 🙏 😸

-- heml value
networkPolicy:
   extraIngress:
      - ports:
         - protocol: TCP
           port: 4143 # Linkerd KEEP!

[adleong]

Hi @99hops! This behavior is documented at https://linkerd.io/2-edge/features/protocol-detection/#using-networkpolicy-resources-with-opaque-ports. If you have suggestions for improving those docs with networkPolicy configuration examples, the easiest thing would be to open a Pull Request on our docs here: https://github.com/linkerd/website/pulls