For those wondering, RFC's can be installed to /usr/share/doc/rfc/txt/ with the rfc package[0] on Arch Linux. Ubuntu has the doc-rfc package[1] with installs to /usr/share/doc/RFC.

[0]: https://www.archlinux.org/packages/community/any/rfc/

[1]: https://packages.ubuntu.com/xenial/doc-rfc