OSDOCS-16143 ExternalDNS Release Note Update

[jmanthei]

Version(s):

Issue: https://issues.redhat.com/browse/OSDOCS-16143

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Fri Sep 12 02:29:57 - Prow CI generated the docs preview:

https://98924--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/networking_operators/external_dns_operator/external-dns-operator-release-notes.html

[openshift-ci]

@jmanthei: all tests passed!

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[jmanthei]

@lihongan would you please QC this. Thank you.

[lihongan]

LGTM. thank you!

[jmanthei]

/label merge-review-needed

[jab-rh]

/cherry-pick enterprise-4.20

[openshift-cherrypick-robot]

@jab-rh: new pull request created: #99022

In response to this:

/cherry-pick enterprise-4.20

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