OSDOCS-11871: Added documents for External DNS Operator versioning

[dfitzmau]

Version(s):
4.16+

Issue:
OSDOCS-11871

Link to docs preview:

• https://117405--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/networking_operators/external_dns_operator/understanding-external-dns-operator.html

• SME has approved this change.
• QE has approved this change.

[openshift-ci-robot]

@dfitzmau: This pull request references OSDOCS-11871 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Version(s):
4.16+

Issue:
OSDOCS-11871

Link to docs preview:

• SME has approved this change.
• QE has approved this change.

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[ocpdocs-previewbot]

🤖 Thu Aug 06 12:02:59 - Prow CI generated the docs preview:

https://117405--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/networking_operators/external_dns_operator/understanding-external-dns-operator.html

[openshift-ci]

@dfitzmau: all tests passed!

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