change code shell for cis examples

[andrewhatfield]

Changed the "full list of examples" from individual shell markdown to a single group.

[d2iq-shadowbq]

maybe remove the bullets, as they have no context in shell highlights.

If you list multiple subcommands, use the k8s way of showing subcommands with docs

kubectl attach my-pod -i                            # Attach to Running Container
kubectl exec my-pod -- ls /                         # Run command in existing pod (1 container case)
kubectl exec my-pod -c my-container -- ls /         # Run command in existing pod (multi-container case)
kubectl top pod POD_NAME --containers               # Show metrics for a given pod and its containers