Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-frauddetector-1385.json

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+{
+  "category": "``frauddetector``", 
+  "type": "api-change", 
+  "description": "[``botocore``] This release adds support for ML Explainability to display model variable importance value in Amazon Fraud Detector."
+}

.changes/next-release/api-change-mediaconvert-22343.json

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+{
+  "category": "``mediaconvert``", 
+  "type": "api-change", 
+  "description": "[``botocore``] MediaConvert now supports color, style and position information passthrough from 608 and Teletext to SRT and WebVTT subtitles. MediaConvert now also supports Automatic QVBR quality levels for QVBR RateControlMode."
+}

.changes/next-release/api-change-sagemaker-30222.json

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+{
+  "category": "``sagemaker``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Releasing new APIs related to Tuning steps in model building pipelines."
+}