Update CHANGELOG.md

Author: xrmx

CHANGELOG.md

@@ -17,7 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3258](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3258))
 - `opentelemetry-instrumentation-botocore` Add support for GenAI system events
   ([#3266](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3266))
-- `opentelemetry-instrumentation` make it simpler to initialize auto-instrumentation manually
+- `opentelemetry-instrumentation` make it simpler to initialize auto-instrumentation programmatically
   ([#3273](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3273))
 
 ### Fixed