Point light docs should explain fields

[torsteingrindvik]

How can Bevy's documentation be improved?

http://dev-docs.bevyengine.org/bevy/pbr/struct.PointLight.html

It's not obvious from reading the point light definition what the range and radius fields do.

• Is range a hard cut-off? If intensity is extremely large and range is e.g. 3.0, will there be no light contribution onto objects >3.0 units away, or does it taper?
• It's a point light not a sphere, so what does radius really mean, is perhaps that the cut-off?
• If instead radius means we have a "sphere light", does it mean something like the light starts emitting from the surface of the radius and until radius+range from the light position?

Also nit: The LED (Watts is missing a trailing parenthesis