This revision is a part of doc migration from Subversion to Git.
Reminder: [[ https://docs.freebsd.org/en/books/handbook/security/#_format_of_a_security_advisory | FreeBSD security advisory example ]] and [[ https://docs.freebsd.org/en/books/handbook/security/#_format_of_a_security_advisory | Mirroring using Subversion ]] should be updated/removed after FreeBSD 12 meets EOL date on 2023/12/31.