fix labels-metric-allow-list documentation

[Mikulas]

The parser defined in types.go does not expect quotes
https://github.com/kubernetes/kube-state-metrics/blob/release-2.0/pkg/options/types.go#L136-L140
https://github.com/kubernetes/kube-state-metrics/blob/release-2.0/pkg/options/types_test.go#L168

This issue is unfortunate because ksm does parse the quoted syntax fine but the labels never match (eg label is foo but ksm matches against "foo"). As such this is pretty important patch for the 2.0 release. Further improvements could be made but this documentation fix is the bare minimum.

Targeting release-2.0 (or should this be based on master and backported afterwards?)

[Mikulas]

/kind bug
/kind documentation

[Mikulas]

/label release-2.0

[k8s-ci-robot]

@Mikulas: The label(s) /label release-2.0 cannot be applied. These labels are supported: api-review, community/discussion, community/maintenance, community/question, cuj/build-train-deploy, cuj/multi-user, platform/aws, platform/azure, platform/gcp, platform/minikube, platform/other, tide/merge-method-merge, tide/merge-method-rebase, tide/merge-method-squash

In response to this:

/label release-2.0

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[brancz]

Thank you! lgtm 👍

/lgtm

[k8s-ci-robot]

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