Add changelog entries from botocore

.changes/next-release/api-change-dynamodb-20270.json

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

.changes/next-release/api-change-ec2-10440.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "[``botocore``] This release adds support for a new boot mode for EC2 instances called 'UEFI Preferred'."
+}

.changes/next-release/api-change-macie2-70618.json

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+{
+  "type": "api-change",
+  "category": "``macie2``",
+  "description": "[``botocore``] Documentation updates for Amazon Macie"
+}

.changes/next-release/api-change-mediaconvert-46951.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "[``botocore``] The AWS Elemental MediaConvert SDK has improved handling for different input and output color space combinations."
+}

.changes/next-release/api-change-medialive-96457.json

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+{
+  "type": "api-change",
+  "category": "``medialive``",
+  "description": "[``botocore``] AWS Elemental MediaLive adds support for Nielsen watermark timezones."
+}

.changes/next-release/api-change-transcribe-78872.json

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+{
+  "type": "api-change",
+  "category": "``transcribe``",
+  "description": "[``botocore``] Amazon Transcribe now supports role access for these API operations: CreateVocabulary, UpdateVocabulary, CreateVocabularyFilter, and UpdateVocabularyFilter."
+}