Update CHANGELOG.md

Co-authored-by: Copilot <[email protected]>

Author: trask

CHANGELOG.md

@@ -26,7 +26,7 @@
 
 ### 📈 Enhancements
 
-- JMX metrics: require explicit unit in yaml
+- JMX metrics: require explicit unit in YAML
   ([#13796](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/13796))
 - Remove deprecated methods from runtime-telemetry
   ([#13885](https://github.com/open-telemetry/opentelemetry-java-instrumentation/pull/13885))