HSLA valid range discussion

[bevy::prelude::Color::Hsla::lightness](https://docs.rs/bevy/latest/bevy/prelude/enum.Color.html#variant.Hsla.field.lightness)

The docs say that the valid range is [0, 1]. However, when it comes to HDR rendering, lightness > 1.0 can be used to make a color more bright, and is useful for instance with bloom.

Should we change the docs? Introduce a separate "brightness" field to sprites or something? What's the right solution?

Thanks to a user on discord for pointing this out :)