[css-color-4] No longer require as-specified hue to be retained, fix w3c#7782

Author: svgeesus

css-color-4/Overview.bs

@@ -956,14 +956,11 @@ Hue is represented as an angle of the color circle
 
 Because this value is so often given in degrees,
 the argument can also be given as a number,
-which is interpreted as a number of degrees.
-
-This number is not constrained
-to the range [0,360]
-but is unbounded.
-Certain operations,
-such as hue interpolation,
-may normalize the hue angle during calculations.
+which is interpreted as a number of degrees
+and is the [=canonical unit=].
+
+This number is normalized
+to the range [0,360].
 
 Note: The angles and spacing
 corresponding to particular hues