Add missing kubebuilder annotation to the getting started document

[natalefalco]

I changed the documentation, so it will contain a working example

Previously, the example not generated the deep copy function required by the SchemeBuilder.Register

It fixes #1586 issue, that complains about the not out of box working example

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[k8s-ci-robot]

Hi @natalefalco. 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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[natalefalco]

/check-cla

[camilamacedo86]

Hi @natalefalco,

Really tks for your contribution 👍 . Just a few nits for we are able to merge it:

• See that still missing one marker
• Also, all commits need to be squashed.

[camilamacedo86]

/ok-to-test

[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-16-2

[estroz]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: estroz, natalefalco

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[camilamacedo86]

/lgtm