[DOCS] List of API changes for 7.11

[jmikell821]

Cases

elastic/kibana#82715 - Create comment types.
elastic/kibana#84731 - Sync cases with alerts.
elastic/kibana#84321 - A new status was added for cases called in-progress.
elastic/kibana#84587 - Move mappings from actions to cases.
elastic/kibana#82519 - New action subactions.

UI changes:
elastic/kibana#82996 - You can attach an alert to a case from the detections page
elastic/kibana#84731 - Sync alerts toggle switch.
elastic/kibana#84450 - Alerts comment UI

[narcher7]

• Update screenshots in the cases documentation.
• Ensure that the cases documentation covers how comments work.