Add changelog entries from botocore

.changes/next-release/api-change-dynamodb-88310.json

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+{
+  "type": "api-change",
+  "category": "``dynamodb``",
+  "description": "[``botocore``] Documentation only updates for DynamoDB."
+}

.changes/next-release/api-change-iotfleetwise-13340.json

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+{
+  "type": "api-change",
+  "category": "``iotfleetwise``",
+  "description": "[``botocore``] AWS IoT FleetWise now supports listing vehicles with attributes filter, ListVehicles API is updated to support additional attributes filter."
+}

.changes/next-release/api-change-managedblockchain-32834.json

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+{
+  "type": "api-change",
+  "category": "``managedblockchain``",
+  "description": "[``botocore``] This is a minor documentation update to address the impact of the shut down of the Goerli and Polygon networks."
+}