docs: add PR link to the CHANGELOG

Author: EchoEllet

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Bosnian (bs), Macedonian (mk) and Gujarati (gu) language translations [#2455](https://github.com/singerdmx/flutter-quill/pull/2455).
-- `textSpanBuilder` to `QuillEditorConfig` to allow overriding how text content is rendered.
+- `textSpanBuilder` to `QuillEditorConfig` to allow overriding how text content is rendered [#2470](https://github.com/singerdmx/flutter-quill/pull/2470).
 
 ## [11.0.0-dev.21] - 2025-01-21