📖 small fixes to extending_cli_features_and_plugins.md

[monteiro-renato]

No description provided.

[k8s-ci-robot]

Hi @monteiro-renato. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[camilamacedo86]

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[camilamacedo86]

/skip pull-kubebuilder-e2e-k8s-1-29-2
/skip pull-kubebuilder-e2e-k8s-1-30-0
/skip pull-kubebuilder-e2e-k8s-1-31-0
/skip pull-kubebuilder-test