Description of problem:

The etcd client cert have been moved from namespace: openshift-monitor to openshift-etcd from ocp 4.14, so doc should be updated to remove 'openshift-monitoring' to erase user's confuse.
as there is concern prompt from: https://redhat-internal.slack.com/archives/C027U68LP/p1748504468676499

there is pr to trace this updating: https://github.com/openshift/cluster-monitoring-operator/pull/2116

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Client secrets (etcd-client, etcd-metric-client, etcd-metric-signer, and etcd-signer) are added to the openshift-config, openshift-etcd, openshift-monitoring, and openshift-kube-apiserver namespaces.
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in Doc: https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/security_and_compliance/certificate-types-and-descriptions#services-3

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