Background gradients not working on docs

Created by: sts-ryan-holton

Just noticed that the Background gradients aren't working on the Bootstrap 4.1.3 (https://getbootstrap.com/docs/4.1/utilities/colors/#background-gradient). See below image:

if you highlight over the page, the text is clearly there for the gradients, but they're not showing:

Viewing in latest Google Chrome, Macbook Pro 15 inch.