This feature changed on an almost daily basis in the 9.2.1.x series as various bugs were worked out. To be honest, I don't know where it finally settled at. Once 9.2.1.2 settles on the mirrors, I'll make note on the doc.freenas.org page that users should refer to the 9.2.1 Guide and the release notes for 9.2.1.1 and 9.2.1.2. Not publishing a new version of the guide is is normal for bug fix point releases as, in theory, no new features are added, just bugs fixed.
The next new version of the published docs will be with 9.2.2 as many new features are in the queue to be added. As that gets written, this
page will be updated to also include the URLs to the bug fixes and release notes for the interim bug fix releases that occurred between 9.2.1 and 9.2.2.