MCO-1533: Update MachineConfigNode Enhancement

[isabella-janssen]

This updates the MCN enhancement with:

• Changes made to the API for GA
• Updates that were made to MCN functionality since this enhancement's last update
• General cleanup/clarification/spelling corrections, etc.

[openshift-ci-robot]

@isabella-janssen: This pull request references MCO-1533 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 the "4.19.0" version, but no target version was set.

In response to this:

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[openshift-ci]

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[openshift-ci]

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[openshift-ci-robot]

@isabella-janssen: This pull request references MCO-1533 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 the "4.19.0" version, but no target version was set.

In response to this:

This updates the MCN enhancement with:

• Changes made to the API for GA
• Updates that were made to MCN functionality since this enhancement's last update
• General cleanup/clarification/spelling corrections, etc.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.