API Reference Link seems broken on Documentation

[aboese]

API Reference Link seems broken on Documentation:
This link, "https://petstore.swagger.io/?url=https://raw.githubusercontent.com/fnproject/fn/master/docs/swagger.yml"
does not seem to go anywhere useful, unless the reference page is itself an API, in which case, I'm just not one of the cool kids. Either way let me know.

K THX.