Man page for periodic.conf has three typos: monthly_status_security_enable (bool) Monthly counterpart of daily_status_securiy_enable. monthly_status_security_inline (bool) Monthly counterpart of daily_status_securiy_inline. monthly_status_security_output (str) Monthly counterpart of daily_status_securiy_output. Should be: "Monthly counterpart of daily_status_security..." with a "t" in security.
A commit references this bug: Author: maxim Date: Sun Feb 22 19:42:51 UTC 2015 New revision: 279185 URL: https://svnweb.freebsd.org/changeset/base/279185 Log: o Typo: securiy -> security. PR: 197927 Submitted by: mike.543@comcast.net MFC after: 1 week Changes: head/share/man/man5/periodic.conf.5
I think it is safe to assume that this PR can be closed as the patch has propagated to all currently supported FreeBSD releases.