Which comma style does the FreeBSD handbook use? Or is that up to individual contributors and editors?

[Pau Amma]

On Tue, October 8, 2019 3:45 pm, Benjamin Kaduk wrote:
> https://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/writing-style-guidelines.html
> says "use the serial comma".

Thanks.