Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-dynamodb-86524.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``dynamodb``",
+  "description": "Documentation only updates for DynamoDB."
+}

.changes/next-release/api-change-iotfleetwise-26520.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``iotfleetwise``",
+  "description": "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-53634.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``managedblockchain``",
+  "description": "This is a minor documentation update to address the impact of the shut down of the Goerli and Polygon networks."
+}