add newline to changelog

Author: benkawecki

instrumentation-genai/opentelemetry-instrumentation-openai-v2/CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3226](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3226))
 - Filter out attributes with the value of NOT_GIVEN for chat.completions.create.
   ([#3760](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3760))
+
 ## Version 2.1b0 (2025-01-18)
 
 - Coerce openai response_format to semconv format