clarify CHANGELOG for polygonToCellsExperimental

CHANGELOG.md

@@ -6,11 +6,13 @@ The public API of this library consists of the functions declared in file
 [h3api.h.in](./src/h3lib/include/h3api.h.in).
 
 ## [Unreleased]
+### Added
+- Added experimental new algorithm for `polygonToCells`, called `polygonToCellsExperimental`, that supports more containment flags and is more memory-efficient (#785)
+
 ### Fixed
 - Fixed compacting all or many resolution 1 cells (#919)
 
 ### Changed
-- Replace internal algorithm for `polygonToCells` with a new version that is more memory-efficient (#785)
 - Reorganize tests into public / internal. (#762)
 - Performance enhancement for aarch64, may improve other platforms (#790, #792, #852, #905, #913)
 - `clang-format` upgraded to version 14. (#834)