Update changelog based on model updates

.changes/next-release/api-change-cloud9-35796.json

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+{
+  "type": "api-change",
+  "category": "``cloud9``",
+  "description": "Update to include information on Ubuntu 18 deprecation."
+}

.changes/next-release/api-change-drs-96405.json

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+{
+  "type": "api-change",
+  "category": "``drs``",
+  "description": "Updated existing APIs and added new ones to support using AWS Elastic Disaster Recovery post-launch actions. Added support for new regions."
+}

.changes/next-release/api-change-firehose-23310.json

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+{
+  "type": "api-change",
+  "category": "``firehose``",
+  "description": "DocumentIdOptions has been added for the Amazon OpenSearch destination."
+}

.changes/next-release/api-change-guardduty-12487.json

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+{
+  "type": "api-change",
+  "category": "``guardduty``",
+  "description": "Add `managementType` field to ListCoverage API response."
+}

.changes/next-release/api-change-internetmonitor-68018.json

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+{
+  "type": "api-change",
+  "category": "``internetmonitor``",
+  "description": "This release updates the Amazon CloudWatch Internet Monitor API domain name."
+}

.changes/next-release/api-change-ivsrealtime-70669.json

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+{
+  "type": "api-change",
+  "category": "``ivs-realtime``",
+  "description": "Doc only update that changes description for ParticipantToken."
+}

.changes/next-release/api-change-simspaceweaver-17657.json

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+{
+  "type": "api-change",
+  "category": "``simspaceweaver``",
+  "description": "Edited the introductory text for the API reference."
+}

.changes/next-release/api-change-xray-12631.json

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+{
+  "type": "api-change",
+  "category": "``xray``",
+  "description": "Add StartTime field in GetTraceSummaries API response for each TraceSummary."
+}