Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-backupgateway-84739.json

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+{
+  "type": "api-change",
+  "category": "``backup-gateway``",
+  "description": "Changes include: new GetVirtualMachineApi to fetch a single user's VM, improving ListVirtualMachines to fetch filtered VMs as well as all VMs, and improving GetGatewayApi to now also return the gateway's MaintenanceStartTime."
+}

.changes/next-release/api-change-devicefarm-51702.json

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+{
+  "type": "api-change",
+  "category": "``devicefarm``",
+  "description": "This release adds the support for VPC-ENI based connectivity for private devices on AWS Device Farm."
+}

.changes/next-release/api-change-ec2-40630.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Documentation updates for Amazon EC2."
+}

.changes/next-release/api-change-glue-78429.json

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+{
+  "type": "api-change",
+  "category": "``glue``",
+  "description": "Added support for S3 Event Notifications for Catalog Target Crawlers."
+}

.changes/next-release/api-change-identitystore-30155.json

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+{
+  "type": "api-change",
+  "category": "``identitystore``",
+  "description": "Documentation updates for the Identity Store CLI Reference."
+}