docs: updated etcdctl example

[vitaliyf]

On a modern (k8s and kops 1.31.x) cluster, etcd CLI tools are located in:

# /opt/etcd-v3.5.13/etcdctl version
etcdctl version: 3.5.13
API version: 3.5

so I updated the docs example to point to the right place, so it can be used as-is.

[k8s-ci-robot]

Hi @vitaliyf. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

Thanks @vitaliyf!
/lgtm
/approve

[k8s-ci-robot]

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