Update changelog based on model updates

.changes/next-release/api-change-codepipeline-38354.json

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+{
+  "type": "api-change",
+  "category": "``codepipeline``",
+  "description": "Add ability to manually and automatically roll back a pipeline stage to a previously successful execution."
+}

.changes/next-release/api-change-cognitoidp-39921.json

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+{
+  "type": "api-change",
+  "category": "``cognito-idp``",
+  "description": "Add LimitExceededException to SignUp errors"
+}

.changes/next-release/api-change-connectcampaigns-54144.json

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+{
+  "type": "api-change",
+  "category": "``connectcampaigns``",
+  "description": "This release adds support for specifying if Answering Machine should wait for prompt sound."
+}

.changes/next-release/api-change-marketplaceentitlement-50097.json

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+{
+  "type": "api-change",
+  "category": "``marketplace-entitlement``",
+  "description": "Releasing minor endpoint updates."
+}

.changes/next-release/api-change-oam-94320.json

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+{
+  "type": "api-change",
+  "category": "``oam``",
+  "description": "This release introduces support for Source Accounts to define which Metrics and Logs to share with the Monitoring Account"
+}

.changes/next-release/api-change-rds-81269.json

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+{
+  "type": "api-change",
+  "category": "``rds``",
+  "description": "SupportsLimitlessDatabase field added to describe-db-engine-versions to indicate whether the DB engine version supports Aurora Limitless Database."
+}

.changes/next-release/api-change-support-69921.json

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+{
+  "type": "api-change",
+  "category": "``support``",
+  "description": "Releasing minor endpoint updates."
+}