Add changelog

Author: xrmx

CHANGELOG.md

@@ -32,6 +32,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3676](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3676))
 - `opentelemetry-instrumentation-dbapi`: Adds sqlcommenter to documentation.
   ([#3720](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3720))
+- `opentelemetry-instrumentation-httpx`: add support for url exclusions via `OTEL_PYTHON_EXCLUDED_URLS` / `OTEL_PYTHON_HTTPX_EXCLUDED_URLS`
+  ([#3837](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3837))
 
 ## Version 1.37.0/0.58b0 (2025-09-11)