update CHANGELOG.md

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Breaking changes
 
+- Add return statement to Confluent kafka Producer poll() and flush() calls when instrumented by ConfluentKafkaInstrumentor().instrument_producer() ([#2527](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2527))
 - Rename `type` attribute to `asgi.event.type` in `opentelemetry-instrumentation-asgi`
   ([#2300](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2300))
 - Rename AwsLambdaInstrumentor span attributes `faas.id` to `cloud.resource_id`, `faas.execution` to `faas.invocation_id`
@@ -124,7 +125,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#1959](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1959))
 - `opentelemetry-resource-detector-azure` Added dependency for Cloud Resource ID attribute
   ([#2072](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2072))
-  
+
 ## Version 1.21.0/0.42b0 (2023-11-01)
 
 ### Added