Updates UDN open-default-ports annotation

[stevsmit]

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• QE has approved this change.

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[ocpdocs-previewbot]

🤖 Tue May 20 19:13:48 - Prow CI generated the docs preview:

https://93559--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/multiple_networks/primary_networks/about-user-defined-networks.html

[openshift-ci]

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[bergerhoffer]

The branch/enterprise-4.20 label has been added to this PR.

This is because your PR targets the main branch and is labeled for enterprise-4.19. And any PR going into main must also target the latest version branch (enterprise-4.20).

If the update in your PR does NOT apply to version 4.20 onward, please re-target this PR to go directly into the appropriate version branch or branches (enterprise-4.x) instead of main.