Native font stack does not match documentation

Created by: jfinkels

The documentation for version 4.0.0-alpha4 states that the "Ubuntu" font family is part of the default native font stack (http://v4-alpha.getbootstrap.com/content/reboot/#native-font-stack). I tested the "Hello, world!" example from the Getting Started page by viewing the file with Firefox version 48.0 on Ubuntu 16.04, but the computed font-family for body seems to be

-apple-system,
BlinkMacSystemFont,
"Segoe UI",
Roboto,
"Helvetica Neue",Arial,sans-serif

The documentation suggests that this should be

-apple-system,
BlinkMacSystemFont,
"Segoe UI",
"Roboto",
"Oxygen",
"Ubuntu",
"Cantarell",
"Fira Sans",
"Droid Sans",
"Helvetica Neue", Arial, sans-serif !default;

Specifically, the documentation includes the following families that the actual code does not have:

"Oxygen",
"Ubuntu",
"Cantarell",
"Fira Sans",
"Droid Sans",

Maybe this is a documentation/code mismatch?