Kubectl exec deprecation warning in troubleshooting document

[aknot242]

Describe the bug
Instructions in troubleshooting document uses an outdated kubectl exec syntax that throws a deprecation warning.

To Reproduce
Steps to reproduce the behavior:

❯ kubectl exec -it -n nginx-gateway $NGINX_POD -c nginx /bin/sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
E0710 07:52:34.700510   45075 websocket.go:296] Unknown stream id 1, discarding message
       / $ exit
❯ kubectl exec -it -n nginx-gateway $NGINX_POD -c nginx -- /bin/sh
/ $ 

Expected behavior

❯ kubectl exec -it -n nginx-gateway $NGINX_POD -c nginx -- /bin/sh
/ $ 

Your environment

❯ kubectl version
Client Version: v1.30.2
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.30.1-eks-1de2ab1

Additional context
Add any other context about the problem here. Any log files you want to share.