Fix CHANGELOG.md formatting for PR open-telemetry#3766 reference

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

Author: Copilot

CHANGELOG.md

@@ -19,8 +19,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add `rstcheck` to pre-commit to stop introducing invalid RST
   ([#3777](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3777))
 
-- `opentelemetry-exporter-credential-provider-gcp`: create this package which provides support for supplying your machine's Application Default Credentials (https://cloud.google.com/docs/authentication/application-default-credentials) to the OTLP Exporters created automatically by OpenTelemetry Python's auto instrumentation. These credentials authorize OTLP traces to be sent to `telemetry.googleapis.com`. 
-[#3766](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3766).
+- `opentelemetry-exporter-credential-provider-gcp`: create this package which provides support for supplying your machine's Application Default Credentials (https://cloud.google.com/docs/authentication/application-default-credentials) to the OTLP Exporters created automatically by OpenTelemetry Python's auto instrumentation. These credentials authorize OTLP traces to be sent to `telemetry.googleapis.com`
+  ([#3766](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3766)).
 
 ## Version 1.37.0/0.58b0 (2025-09-11)