Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-cloudfront-17953.json

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+{
+  "type": "api-change",
+  "category": "``cloudfront``",
+  "description": "This release adds new origin timeout options: 1) ResponseCompletionTimeout and 2) OriginReadTimeout (for S3 origins)"
+}

.changes/next-release/api-change-docdb-10910.json

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+{
+  "type": "api-change",
+  "category": "``docdb``",
+  "description": "Add support for setting Serverless Scaling Configuration on clusters."
+}

.changes/next-release/api-change-ds-61476.json

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+{
+  "type": "api-change",
+  "category": "``ds``",
+  "description": "This release adds support for AWS Managed Microsoft AD Hybrid Edition, introducing new operations: StartADAssessment, DescribeADAssessment, ListADAssessments, DeleteADAssessment, CreateHybridAD, UpdateHybridAD, and DescribeHybridADUpdate; and updated existing operation: DescribeDirectories."
+}

.changes/next-release/api-change-ec2-88157.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Release to show the next hop IP address for routes propagated by VPC Route Server into VPC route tables."
+}

.changes/next-release/api-change-iotwireless-82371.json

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+{
+  "type": "api-change",
+  "category": "``iotwireless``",
+  "description": "Added TxPowerIndexMin, TxPowerIndexMax, NbTransMin and NbTransMax params to ServiceProfile."
+}