Add 'kubectl cert-manager check api' docs

[inteon]

No description provided.

[jetstack-bot]

Hi @inteon. Thanks for your PR.

I'm waiting for a cert-manager 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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[maelvls]

/ok-to-test

[wallrj]

Thanks @inteon

/lgtm
/approve

[wallrj]

/approve

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: inteon, wallrj

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