[css-color-5] color serialization now defined in css-color-4

Author: svgeesus

css-color-5/Overview.bs

@@ -785,7 +785,6 @@ and then interpolated as Lab colors.
 Host syntax can override the interpolation color space and specify which color space is used for interpolation.
 For example, 'color-mix' and 'color-adjust' override the default to LCH.
 
-Issue: Should the colors at 0% and 100% be serialized with their original color spaces or converted to the interpolation space?
 
 Interpolating with alpha {#interpolation-alpha}
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