docs: update CHANGELOG for PR #1810

Co-Authored-By: Claude Sonnet 4.6 (200K context) <noreply@anthropic.com>
Signed-off-by: Haotian Zhang <928016560@qq.com>

CHANGELOG.md

@@ -11,3 +11,4 @@
 - [fix: prepend context-path to contract reporter API paths](https://github.com/Tencent/spring-cloud-tencent/pull/1803)
 - [feat: support overrideHost configuration for ratelimit, event reporter and stat modules](https://github.com/Tencent/spring-cloud-tencent/pull/1804)
 - [fix: split contract base-package for springdoc scan](https://github.com/Tencent/spring-cloud-tencent/pull/1807)
+- [fix: inject baggage as W3C header for reactive clients to avoid OTel scope leak](https://github.com/Tencent/spring-cloud-tencent/pull/1810)