Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -31,6 +31,7 @@ and this project adheres to [Semantic Versioning](https://semver.org). Thia is a
 
 - Slightly better support for escaped characters in Xlsx Reader/Writer. [Discussion #4724](https://github.com/PHPOffice/PhpSpreadsheet/discussions/4724) [PR #4726](https://github.com/PHPOffice/PhpSpreadsheet/pull/4726)
 - CODE/UNICODE and CHAR/UNICHAR. [PR #4727](https://github.com/PHPOffice/PhpSpreadsheet/pull/4727)
+- Minor changes to TextGrid. [PR #4735](https://github.com/PHPOffice/PhpSpreadsheet/pull/4735)
 
 ## 2025-11-24 - 5.3.0