Update changelog based on model updates

.changes/next-release/api-change-cloudformation-96974.json

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+{
+  "type": "api-change",
+  "category": "``cloudformation``",
+  "description": "SDK and documentation updates for GetTemplateSummary API (unrecognized resources)"
+}

.changes/next-release/api-change-ec2-81579.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Amazon EC2 documentation updates."
+}

.changes/next-release/api-change-grafana-15523.json

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+{
+  "type": "api-change",
+  "category": "``grafana``",
+  "description": "Amazon Managed Grafana now supports grafanaVersion update for existing workspaces with UpdateWorkspaceConfiguration API. DescribeWorkspaceConfiguration API additionally returns grafanaVersion. A new ListVersions API lists available versions or, if given a workspaceId, the versions it can upgrade to."
+}

.changes/next-release/api-change-medicalimaging-29096.json

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+{
+  "type": "api-change",
+  "category": "``medical-imaging``",
+  "description": "General Availability (GA) release of AWS Health Imaging, enabling customers to store, transform, and analyze medical imaging data at petabyte-scale."
+}

.changes/next-release/api-change-ram-33725.json

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+{
+  "type": "api-change",
+  "category": "``ram``",
+  "description": "This release adds support for securely sharing with AWS service principals."
+}

.changes/next-release/api-change-ssmsap-83541.json

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+{
+  "type": "api-change",
+  "category": "``ssm-sap``",
+  "description": "Added support for SAP Hana High Availability discovery (primary and secondary nodes) and Backint agent installation with SSM for SAP."
+}

.changes/next-release/api-change-wafv2-65940.json

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+{
+  "type": "api-change",
+  "category": "``wafv2``",
+  "description": "Added the URI path to the custom aggregation keys that you can specify for a rate-based rule."
+}