📖 Update cert-manager install url because it changed

[rocrisp]

Pretty much what the title says.
The outdated link has been replaced with an new link.

[k8s-ci-robot]

Hi @rocrisp. 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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[estroz]

/ok-to-test
/approve
/lgtm

[estroz]

@rocrisp you need to sign the CLA too

[camilamacedo86]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, estroz, rocrisp

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[k8s-triage-robot]

Unknown CLA label state. Rechecking for CLA labels.

Send feedback to sig-contributor-experience at kubernetes/community.

/check-cla

[camilamacedo86]

hi @rocrisp,

Could you please check cla/linuxfoundation — rocrisp needs CLA, we cannot merge without it pass.

[camilamacedo86]

/retest CLA

[k8s-ci-robot]

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[rocrisp]

I signed it