All changes in the package are documented in the main repository. See: https://github.com/ckeditor/ckeditor5-dev/blob/master/CHANGELOG.md.
This package was extracted from @ckeditor/ckeditor5-dev-docs in version v31.1.13. Its previous changelog can be found here: ckeditor5-dev-docs@31.1.13/CHANGELOG.md