Documentation: ColorMap.Scope

[tymarats]

On ColorMap docs page, ColorMapScope is mentioned, which should actually be ColorMap.Scope. While this is trivial to fix, it's not easy to figure out from the docs how it works.

It might be useful to illustrate it in this fiddle: https://fiddle.cxjs.io/?f=gs69CxgF (referenced from Legend docs page), and just put the reference to this example.