Update CHANGELOG.md

Author: oleibman

CHANGELOG.md

@@ -30,6 +30,8 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Handling User-supplied Decimal and Thousands Separators. [Issue #3900](https://github.com/PHPOffice/PhpSpreadsheet/issues/3900) [PR #3903](https://github.com/PHPOffice/PhpSpreadsheet/pull/3903)
 - Improve Performance of CSV Writer. [Issue #3904](https://github.com/PHPOffice/PhpSpreadsheet/issues/3904) [PR #3906](https://github.com/PHPOffice/PhpSpreadsheet/pull/3906)
 - Fix issue with prepending zero in percentage [Issue #3920](https://github.com/PHPOffice/PhpSpreadsheet/issues/3920) [PR #3921](https://github.com/PHPOffice/PhpSpreadsheet/pull/3921)
+- Incorrect SUMPRODUCT Calculation [Issue #3909](https://github.com/PHPOffice/PhpSpreadsheet/issues/3909) [PR #3916](https://github.com/PHPOffice/PhpSpreadsheet/pull/3916)
+- Formula Misidentifying Text as Cell After Insertion/Deletion [Issue #3907](https://github.com/PHPOffice/PhpSpreadsheet/issues/3907) [PR #3915](https://github.com/PHPOffice/PhpSpreadsheet/pull/3915)
 
 ## 2.0.0 - 2024-01-04