📖 Add link to Watching Secondary Resources Owned by the Controller

[guettli]

This PR adds a hyperlink to Watching Secondary Resources That Are Not Owned.

I think that is useful to better understand the text.

[k8s-ci-robot]

Hi @guettli. Thanks for your PR.

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[camilamacedo86]

/lgtm

Thank you 👍

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, guettli

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[camilamacedo86]

/ok-to-test