Website: Troubleshooting guide directs to delete the wrong thing

[mmwebster]

In troubleshooting instructions for deleting the GKE Certificate, the listed command is kubectl -n istio-system delete ingress envoy-ingress, rather than kubectl -n istio-system delete managedcertificate gke-certificate

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Issue-Label Bot is automatically applying the labels:

| Label | Probability |
| ------------- | ------------- |
| kind/bug | 0.88 |
| area/docs | 1.00 |

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[janeman98]

Thanks @mmwebster for submitting this issue.
/cc @abhi-g

[8bitmp3]

Thanks @mmwebster !

/assign @Bobgy

[Bobgy]

@8bitmp3 let's address this separately.
/assign @jlewi
Can you take a look at this issue? I'm not familiar with the reported problem.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.