"<angle>" in gradient syntax links to "localhost"?

[impressivewebs]

On this page:

http://dochub.io/#css/linear-gradient

Notice in the syntax block at the top, the word "<angle>" links to:

mks://localhost/en/CSS/angle

The info is taken from MDN but the MDN page doesn't do that. I guess it's something DocHub is doing that causes this...?