In my opinion, the ERRATA should be in the second box on the main page. After the text "The current release of FreeNAS® is FreeNAS® 220.127.116.11-RELEASE. Users running previous versions are encouraged to upgrade to or install the current release and to refer to the 9.2.1 Users Guide and the Release Notes. A PDF of the Users Guide is available for download here."
For example, "And here is ERRATA for the upcoming 18.104.22.168-RELEASE".
This should be a moot point next week as 22.214.171.124 should be released. Some of the stuff in the ERRATA has also changed since 126.96.36.199.