Move Extending Kubectl from the SIG CLI guides to the kubectl reference

[sreeram-venkitesh]

This is a Feature Request

What would you like to be added

Move the pages under Extending Kubectl from the SIG CLI guides to the upstream kubectl reference

Why is this needed

Part of #25943. The source code to move resides here. You can refer to #45600 to see how it can be done.

Comments

/sig docs
/language-en
/help-wanted

[dipesh-rawat]

/language en
/help

[k8s-ci-robot]

@dipesh-rawat:
This request has been marked as needing help from a contributor.

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In response to this:

/language en
/help

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.

[a-mccarthy]

/triage accepted
/priority important-longterm

[Aryakoste]

/assign