Fix a typo etcdutl -> etcdctl in configure-upgrade-etcd.md

[carinaconsta]

Fix a typo in the command etcdctl

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[network-charles]

Hi @carinaconsta, thanks for opening this PR. Kindly sign the CLA so this PR and all future PRs will be valid.

Also, please see #44050, the current syntax in the doc is correct.