Re-word Changelog for the ECS change

CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to this project will be documented in this file. See [standa
 
 ## [1.92.0](https://github.com/aws/aws-cdk/compare/v1.91.0...v1.92.0) (2021-03-06)
 
+* **ecs-patterns**: the `desiredCount` property stored on the above constructs will be optional, allowing them to be undefined. This is enabled through the `@aws-cdk/aws-ecs-patterns:removeDefaultDesiredCount` feature flag. We would recommend all CDK users to set the `@aws-cdk/aws-ecs-patterns:removeDefaultDesiredCount` flag to `true` for all of their existing applications. 
 
 ### ⚠ BREAKING CHANGES TO EXPERIMENTAL FEATURES
 
@@ -14,9 +15,6 @@ All notable changes to this project will be documented in this file. See [standa
 * **apigatewayv2:** `HttpApiProps.defaultDomainMapping` has been changed from `DefaultDomainMappingOptions` to `DomainMappingOptions`
 * **apigatewayv2:** `HttpApi.defaultStage` has been changed from `HttpStage` to `IStage`
 * **apigatewayv2:** `IHttpApi.defaultStage` has been removed
-* **ecs-patterns:** ** the desiredCount property stored on the above constructs will be optional, allowing them to be undefined. This is enabled through the `@aws-cdk/aws-ecs-patterns:removeDefaultDesiredCount` feature flag. We would recommend all aws-cdk users to set the `REMOVE_DEFAULT_DESIRED_COUNT` flag to true for all of their existing applications. 
-
-Fixes: https://github.com/aws/aws-cdk/issues/12990
 * **aws-appsync:** RdsDataSource now takes a ServerlessCluster instead of a DatabaseCluster
 * **aws-appsync:** graphqlapi.addRdsDataSource now takes databaseName as its fourth argument