Add docs for zpages

[richabanker]

Description

Docs for Kubernetes z-pages

Issue

kubernetes/enhancements#4827
kubernetes/enhancements#4828

[k8s-ci-robot]

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[richabanker]

/sig instrumentation

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[dipesh-rawat]

@richabanker We should consider setting the dev-1.32 branch as the target branch rather than the main branch for this pull request. Since the change is related to the feature targeting v1.32 release.

[richabanker]

@richabanker We should consider setting the dev-1.32 branch as the target branch rather than the main branch for this pull request. Since the change is related to the feature targeting v1.32 release.

Done