Update changelog based on model updates

.changes/next-release/api-change-computeoptimizer-59108.json

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+{
+  "type": "api-change",
+  "category": "``compute-optimizer``",
+  "description": "This release enables AWS Compute Optimizer to analyze and generate optimization recommendations for ecs services running on Fargate."
+}

.changes/next-release/api-change-connect-91638.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "Amazon Connect Chat introduces the Idle Participant/Autodisconnect feature, which allows users to set timeouts relating to the activity of chat participants, using the new UpdateParticipantRoleConfig API."
+}

.changes/next-release/api-change-iotdeviceadvisor-8910.json

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+{
+  "type": "api-change",
+  "category": "``iotdeviceadvisor``",
+  "description": "This release adds the following new features: 1) Documentation updates for IoT Device Advisor APIs. 2) Updated required request parameters for IoT Device Advisor APIs. 3) Added new service feature: ability to provide the test endpoint when customer executing the StartSuiteRun API."
+}

.changes/next-release/api-change-kinesisvideowebrtcstorage-60876.json

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+{
+  "type": "api-change",
+  "category": "``kinesis-video-webrtc-storage``",
+  "description": "Amazon Kinesis Video Streams offers capabilities to stream video and audio in real-time via WebRTC to the cloud for storage, playback, and analytical processing. Customers can use our enhanced WebRTC SDK and cloud APIs to enable real-time streaming, as well as media ingestion to the cloud."
+}

.changes/next-release/api-change-rds-38156.json

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+{
+  "type": "api-change",
+  "category": "``rds``",
+  "description": "Add support for managing master user password in AWS Secrets Manager for the DBInstance and DBCluster."
+}

.changes/next-release/api-change-secretsmanager-4598.json

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+{
+  "type": "api-change",
+  "category": "``secretsmanager``",
+  "description": "Documentation updates for Secrets Manager"
+}