Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-14136.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] Adds support for T3 instances on Amazon EC2 Dedicated Hosts."
+}

.changes/next-release/api-change-iot-71577.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``iot``",
+  "description": "[``botocore``] AWS IoT Rules Engine adds OpenSearch action. The OpenSearch rule action lets you stream data from IoT sensors and applications to Amazon OpenSearch Service which is a successor to Amazon Elasticsearch Service."
+}

.changes/next-release/enhancement-TaggedUnions-30097.json

@@ -0,0 +1,5 @@
+{
+  "category": "Tagged Unions",
+  "type": "enhancement",
+  "description": "[``botocore``] Introducing support for the `union` trait on structures in request and response objects."
+}