TELCODOCS-2708 DITA migration cleanup for update-completing-the-control-plane-only-update.adoc

[lcavalle]

Summary

• Replace 2 [NOTE] callout conversions with simple continuation sentences in troubleshooting-general-review-events.adoc (explaining a flag is not a note)
• Add missing newline at EOF in update-acknowledging-the-update.adoc
• Retain correct "where:" definition list callout conversions in creating-single-etcd-backup.adoc and update-starting-the-cluster-update.adoc

Follows up on #106568.

JIRA

https://issues.redhat.com/browse/TELCODOCS-2708

Test plan

• Vale AsciiDocDITA validation passes with 0 new errors
• Review content changes for accuracy
• Build documentation locally

Made with Cursor

[ocpdocs-previewbot]

🤖 Thu May 14 13:58:41 - Prow CI generated the docs preview:

https://111653--ocpdocs-pr.netlify.app/
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/backup_and_restore/control_plane_backup_and_restore/backing-up-etcd.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/etcd/etcd-backup-restore/etcd-backup.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/troubleshooting/troubleshooting-general-troubleshooting.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/updating/update-before-the-update.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/updating/update-completing-the-control-plane-only-update.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/updating/update-completing-the-y-stream-update.html
https://111653--ocpdocs-pr.netlify.app/openshift-enterprise/latest/post_installation_configuration/day_2_core_cnf_clusters/updating/update-completing-the-z-stream-update.html

[openshift-ci]

@lcavalle: all tests passed!

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