📖 fixes: syntax error in cert manager code example

[KitSutliff]

noticed small syntax error in docs for cert manager and prometheus in the envtest section.
fixed for accuracy.

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[camilamacedo86]

/ok-to-test
/lgtm

Thank you 🥇

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[APPROVALNOTIFIER] This PR is APPROVED

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

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fix/comment

[camilamacedo86]

We will need to get merged first: #3722
then rebase this one with master to get it merged.