Finishing off the documentation updates for cert-manager 1.16.0

[wallrj]

Preview: https://deploy-preview-1576--cert-manager.netlify.app/docs/releases/release-notes/release-notes-1.16/

• Added contributors
• Added upgrade notes
• Generated API and CLI docs
• Updated install version variable

xref:

• https://github.com/cert-manager/cert-manager/issues/7326

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[wallrj]

/hold because I forgot to add the Helm extraenv release note

[wallrj]

/unhold

[inteon]

LGTM, lots of generated changes + I agree with the changes to the release notes

/approve /lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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