modify message

Author: liustve

CHANGELOG.md

@@ -14,7 +14,8 @@ If your change does not need a CHANGELOG entry, add the "skip changelog" label t
 ## Unreleased
 
 ### Enhancements
-- add CloudWatch EMF metrics exporter
+
+- Add CloudWatch EMF metrics exporter for Java Agent and Lambda environment
   ([#1209](https://github.com/aws-observability/aws-otel-java-instrumentation/pull/1209))
 - Support X-Ray Trace Id extraction from Lambda Context object, and respect user-configured OTEL_PROPAGATORS in AWS Lamdba instrumentation
   ([#1191](https://github.com/aws-observability/aws-otel-java-instrumentation/pull/1191))