[css-values-4] Fix the numeric type. #7486

Author: tabatkins

css-values-4/Overview.bs

@@ -3927,13 +3927,13 @@ Type Checking</h3>
 		is the result of [=add two types|adding the types=]
 		of its comma-separated [=calculations=].
 	* The [=CSSNumericValue/type=] of a ''sign()'' expression
-		is «[ "number" → 1 ]».
+		is «[ ]» (empty map).
 	* The [=CSSNumericValue/type=] of a ''sin()'', ''cos()'', or ''tan()'' expression
-		is «[ "number" → 1 ]».
+		is «[ ]» (empty map).
 	* The [=CSSNumericValue/type=] of an ''asin()'', ''acos()'', ''atan()'', or ''atan2()'' expression
-		is «[ "angle" → 1 ]».
+		is «[ ]» (empty map).
 	* The [=CSSNumericValue/type=] of a ''pow()'', ''sqrt()'', ''log()'', or ''exp()'' expression
-		is «[ "number" → 1 ]».
+		is «[ ]» (empty map).
 
 	For each of the above,
 	if the [=CSSNumericValue/type=] is failure,