Document the direction that directional and spot lights emit light in #107279
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I was curious which direction that DirectionalLight2D emitted in, so I checked the docs, but it wasn't documented. I tested that it's +Y, then added it to the documentation. However, this information was also missing from DirectionalLight3D and SpotLight3D, so I have added it to there as well. I also documented that the spot angle is the angular radius.