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Document negative saturation (#15062)

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doc/lua_api.md
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@ -8540,8 +8540,17 @@ child will follow movement and rotation of that bone.
* Passing no arguments resets lighting to its default values.
* `light_definition` is a table with the following optional fields:
* `saturation` sets the saturation (vividness; default: `1.0`).
* values > 1 increase the saturation
* values in [0,1] decrease the saturation
* It is applied according to the function `result = b*(1-s) + c*s`, where:
* `c` is the original color
* `b` is the greyscale version of the color with the same luma
* `s` is the saturation set here
* The resulting color always has the same luma (perceived brightness) as the original.
* This means that:
* values > 1 oversaturate
* values < 1 down to 0 desaturate, 0 being entirely greyscale
* values < 0 cause an effect similar to inversion,
but keeping original luma and being symmetrical in terms of saturation
(eg. -1 and 1 is the same saturation and luma, but different hues)
* `shadows` is a table that controls ambient shadows
* `intensity` sets the intensity of the shadows from 0 (no shadows, default) to 1 (blackness)
* This value has no effect on clients who have the "Dynamic Shadows" shader disabled.