OSDOCS-11732: Add dummy device as additional network

[jab-rh]

• https://issues.redhat.com/browse/OSDOCS-11732

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• QE has approved this change.

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[openshift-ci-robot]

@jab-rh: This pull request references OSDOCS-11732 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 story to target either version "4.21." or "openshift-4.21.", but it targets "openshift-4.20" instead.

In response to this:

• https://issues.redhat.com/browse/OSDOCS-11732

Version(s):

Issue:

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

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[ocpdocs-previewbot]

🤖 Wed Oct 29 22:45:25 - Prow CI generated the docs preview:

https://101391--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/multiple_networks/secondary_networks/creating-secondary-nwt-other-cni.html

[openshift-ci]

@jab-rh: all tests passed!

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