GoTips point to links that should come soon™ but aren't there yet

I'm relatively new to Go and want to learn more about it. I like how the style guide can be very helpful to learn things that are different from other languages I'm familiar with.

In this chapter, though, there are references to GoTip explanations that I would like to read: https://google.github.io/styleguide/go/decisions#interfaces

Can you point me in the right direction?