Properly Document Breaking Change from 1.28.0 (#3737)

See issue #3736.

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 - Drop support for PHP 7.4, according to https://phpspreadsheet.readthedocs.io/en/latest/#php-version-support [PR #3713](https://github.com/PHPOffice/PhpSpreadsheet/pull/3713)
 - RLM Added to NumberFormatter Currency. This happens depending on release of ICU which Php is using (it does not yet happen with any official release). PhpSpreadsheet will continue to use the value returned by Php, but a method is added to keep the result unchanged from release to release. [Issue #3571](https://github.com/PHPOffice/PhpSpreadsheet/issues/3571) [PR #3640](https://github.com/PHPOffice/PhpSpreadsheet/pull/3640)
+- `toFormattedString` will now always return a string. This was introduced with 1.28.0, but was not properly documented at the time. This can affect the results of `toArray`, `namedRangeToArray`, and `rangeToArray`. [PR #3304](https://github.com/PHPOffice/PhpSpreadsheet/pull/3304)
 
 ### Deprecated
 
@@ -140,6 +141,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Improved handling for ? placeholder in Number Format Masks [PR #3394](https://github.com/PHPOffice/PhpSpreadsheet/pull/3394)
 - Improved support for locale settings and currency codes when matching formatted strings to numerics in the Calculation Engine [PR #3373](https://github.com/PHPOffice/PhpSpreadsheet/pull/3373) and [PR #3374](https://github.com/PHPOffice/PhpSpreadsheet/pull/3374) 
 - Improved support for locale settings and matching in the Advanced Value Binder [PR #3376](https://github.com/PHPOffice/PhpSpreadsheet/pull/3376)
+- `toFormattedString` will now always return a string. This can affect the results of `toArray`, `namedRangeToArray`, and `rangeToArray`. [PR #3304](https://github.com/PHPOffice/PhpSpreadsheet/pull/3304)
 
 ### Deprecated
 
@@ -194,7 +196,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Changed
 
-- `toFormattedString` will now always return a string. This can affect the results of `toArray`, `namedRangeToArray`, and `rangeToArray`. [PR #3304](https://github.com/PHPOffice/PhpSpreadsheet/pull/3304)
+- Nothing
 
 ### Deprecated