Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-budgets-61199.json

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+{
+  "type": "api-change",
+  "category": "``budgets``",
+  "description": "This change introduces DescribeBudgetNotificationsForAccount API which returns budget notifications for the specified account"
+}

.changes/next-release/api-change-gamelift-35170.json

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+{
+  "type": "api-change",
+  "category": "``gamelift``",
+  "description": "Increase string list limit from 10 to 100."
+}

.changes/next-release/api-change-transfer-77689.json

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+{
+  "type": "api-change",
+  "category": "``transfer``",
+  "description": "Properties for Transfer Family used with SFTP, FTP, and FTPS protocols. Display Banners are bodies of text that can be displayed before and/or after a user authenticates onto a server using one of the previously mentioned protocols."
+}