Add changelog entries from botocore

.changes/next-release/api-change-ce-72955.json

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+{
+  "type": "api-change",
+  "category": "``ce``",
+  "description": "[``botocore``] This release is to support retroactive Cost Categories. The new field will enable you to retroactively apply new and existing cost category rules to previous months."
+}

.changes/next-release/api-change-kendra-1684.json

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+{
+  "type": "api-change",
+  "category": "``kendra``",
+  "description": "[``botocore``] My AWS Service (placeholder) - Amazon Kendra now provides a data source connector for DropBox. For more information, see https://docs.aws.amazon.com/kendra/latest/dg/data-source-dropbox.html"
+}

.changes/next-release/api-change-location-78764.json

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+{
+  "type": "api-change",
+  "category": "``location``",
+  "description": "[``botocore``] This release adds place IDs, which are unique identifiers of places, along with a new GetPlace operation, which can be used with place IDs to find a place again later. UnitNumber and UnitType are also added as new properties of places."
+}