docs: clarify nfd_node_update_requests_total metric

[marquiz]

No description provided.

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[marquiz]

/assign @ArangoGutierrez

[ArangoGutierrez]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: ab77389dd5f57068ab0ab5d0f9287d627481d563

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArangoGutierrez, marquiz

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[marquiz]

/cherry-pick release-0.14

[k8s-infra-cherrypick-robot]

@marquiz: failed to push cherry-picked changes in GitHub: pushToNamedFork is not implemented in the v2 client

In response to this:

/cherry-pick release-0.14

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[marquiz]

/cherry-pick release-0.14

[k8s-infra-cherrypick-robot]

@marquiz: new pull request created: #1409

In response to this:

/cherry-pick release-0.14

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.