Clarify error message for verify-codegen.sh

[abayer]

Changes

It currently says to run both hack/update-codegen.sh and hack/update-openapigen.sh, but hack/update-codegen.sh actually calls hack/update-openapigen.sh. So let's make the message actually match all that you need to do.

/kind misc

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[abayer]

/assign @jerop @afrittoli @lbernick

[abayer]

/retest

[lbernick]

@JeromeJu it seems like you had some issues here with update-codegen not actually running update-openapigen when you expected it to?

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[APPROVALNOTIFIER] This PR is APPROVED

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[vdemeester]

/lgtm

[abayer]

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