Problems with documentation

When I press F1 to show documentation in an object it doesn't works.

For example in

let url : URL = URL()

If I press F1 in URL() it doesn't show anything, it only works if I press in the type definition.

Is this the intended behaviour? Because for example if I press Cmd + P to show parameters it detects the type of URL()

Also is there any way to link to oficial apple docs?