Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-guardduty-43491.json

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+{
+  "type": "api-change",
+  "category": "``guardduty``",
+  "description": "Updated 9 APIs for feature enablement to reflect expansion of GuardDuty to features. Added new APIs and updated existing APIs to support RDS Protection GA."
+}

.changes/next-release/api-change-resourceexplorer2-32378.json

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+{
+  "type": "api-change",
+  "category": "``resource-explorer-2``",
+  "description": "Documentation updates for APIs."
+}

.changes/next-release/api-change-sagemakerruntime-91685.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker-runtime``",
+  "description": "Update sagemaker-runtime command to latest version"
+}