📖 Fix: broken url in extending_cli_features_and_plugins.md

[monteiro-renato]

Relevant section> https://book.kubebuilder.io/plugins/extending/extending_cli_features_and_plugins#cli-system

[k8s-ci-robot]

Hi @monteiro-renato. Thanks for your PR.

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[camilamacedo86]

/lgtm
/approved

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, monteiro-renato

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[camilamacedo86]

/ok-to-test

[camilamacedo86]

Hi @monteiro-renato

this one we will need a rebase

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[monteiro-renato]

Done!