Mention the builtin clusterrole in kubelet authorization

[tengqm]

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This PR updates the description about the kubelet fine-grained API authorization.

According to the upstream implementation (https://github.com/kubernetes/kubernetes/pull/126347), the fine-grained authorization doesn't include nodes/spec. The previous docs didn't mention that the builtin clusterrole exists and will get updated.

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 4e611ff6b5f4d348b1e8bc6e9b03b6d2a17f4941

[k8s-ci-robot]

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