Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ec2-39071.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "This release adds the GroupLongName field to the response of the DescribeAvailabilityZones API."
+}

.changes/next-release/api-change-ecr-62086.json

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+{
+  "type": "api-change",
+  "category": "``ecr``",
+  "description": "This release adds Amazon ECR to Amazon ECR pull through cache rules support."
+}

.changes/next-release/api-change-ecs-75888.json

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+{
+  "type": "api-change",
+  "category": "``ecs``",
+  "description": "This is a documentation only update for Amazon ECS to address various tickets."
+}

.changes/next-release/api-change-inspector2-79843.json

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+{
+  "type": "api-change",
+  "category": "``inspector2``",
+  "description": "Adding componentArn to network reachability details"
+}

.changes/next-release/api-change-medialive-61253.json

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+{
+  "type": "api-change",
+  "category": "``medialive``",
+  "description": "Add an enum option DISABLED for Output Locking Mode under Global Configuration."
+}