Update Venafi ingress example

[tylerauerbeck]

Updates the Venafi ingress example per #1063

[jetstack-bot]

Hi @tylerauerbeck. Thanks for your PR.

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[JoshVanL]

/lgtm
/approve
/ok-to-test

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoshVanL, tylerauerbeck

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