📖 Fix link in Cluster controller doc

[wfernandes]

Also fix format of status example

Signed-off-by: Warren Fernandes [email protected]

What this PR does / why we need it:
This PR improves documentation.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1478

[k8s-ci-robot]

Hi @wfernandes. Thanks for your PR.

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[vincepri]

/approve
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vincepri, wfernandes

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[vincepri]

/lgtm