docs: changelog

Author: overbalance

CHANGELOG.md

@@ -35,6 +35,7 @@ For notes on migrating to 2.x / 0.200.x see [the upgrade guide](doc/upgrade-to-2
 * chore: remove backcompat workspace [#6238](https://github.com/open-telemetry/opentelemetry-js/pull/6238) @overbalance
 * refactor(core,resources): consolidate platform-specific code [#6208](https://github.com/open-telemetry/opentelemetry-js/pull/6208) @overbalance
 * test(api): remove unnecessary conditional [#6241](https://github.com/open-telemetry/opentelemetry-js/pull/6241) @cjihrig
+* refactor(resources): use runtime check for default service name [#6257](https://github.com/open-telemetry/opentelemetry-js/pull/6257) @overbalance
 
 ## 2.2.0