These only contains a quick overview of the changes that took place between two stable releases. In any case, please refer to the release's documentation to have the full details about new features as well as the full, detailed git changelog if you need to know more details about what happened in a development cycle. Such git changelog can be generated by typing the following command in a terminal (from your local copy of the repository):
That would give you the whole commits comments between commit 4e5a942b and the current master. In order to know which git version matches which stable release, please go to the tags repository.