[css-values-5] Fix normalization steps. #6245

Author: tabatkins

css-values-5/Overview.bs

@@ -894,9 +894,8 @@ Normalizing Mix Percentages</h3>
 		2. For each omitted percentage in |items|,
 			set it to
 			<code>(100% - |specified sum|) / (number of omitted percentages)</code>.
-		3. Let |total| be the sum of the percentages of all the items,
-			clamped to 100%.
-		4. If |total| is greater than 0%,
+		3. Let |total| be the sum of the percentages of all the items.
+		4. If |total| is greater than 100%,
 			or if |total| is greater than 0% and the |force normalization| flag is true,
 			multiply every percentage in |items| by <code>(100% / |total|)</code>.
 		5. If |total| is less than 100%,