Update changelog based on model updates

.changes/next-release/api-change-connectparticipant-79535.json

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+{
+  "type": "api-change",
+  "category": "``connectparticipant``",
+  "description": "Doc only update to GetTranscript API reference guide to inform users about presence of events in the chat transcript."
+}

.changes/next-release/api-change-emr-79406.json

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+{
+  "type": "api-change",
+  "category": "``emr``",
+  "description": "adds fine grained control over Unhealthy Node Replacement to Amazon ElasticMapReduce"
+}

.changes/next-release/api-change-firehose-36231.json

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+{
+  "type": "api-change",
+  "category": "``firehose``",
+  "description": "This release adds support for Data Message Extraction for decompressed CloudWatch logs, and to use a custom file extension or time zone for S3 destinations."
+}

.changes/next-release/api-change-lambda-69656.json

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+{
+  "type": "api-change",
+  "category": "``lambda``",
+  "description": "Documentation-only updates for Lambda to clarify a number of existing actions and properties."
+}

.changes/next-release/api-change-rds-78860.json

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+{
+  "type": "api-change",
+  "category": "``rds``",
+  "description": "Doc only update for a valid option in DB parameter group"
+}

.changes/next-release/api-change-sns-34434.json

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+{
+  "type": "api-change",
+  "category": "``sns``",
+  "description": "This release marks phone numbers as sensitive inputs."
+}