Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-49627.json

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+{
+  "category": "``ec2``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Adding a new reserved field to support future infrastructure improvements for Amazon EC2 Fleet."
+}

.changes/next-release/api-change-sagemaker-89337.json

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+{
+  "category": "``sagemaker``", 
+  "type": "api-change", 
+  "description": "[``botocore``] SageMaker model registry now supports up to 5 containers and associated environment variables."
+}

.changes/next-release/api-change-sqs-67306.json

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+{
+  "category": "``sqs``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Documentation updates for Amazon SQS."
+}