From the release Announcement:
PHP Documentor integration
PHP Documentor is actually the best solution to generate documentation based on PHP code comments. As more and more of you are using this tool, we have integrated its features inside the IDE providing a front-end to its options. This front-end will be available both as a standalone version and an integrated module.
Download links and information about the IDE’s less important features 😉 are available in the Release notes.