[css-values-4] Make %s get the new 'percent' percent hint, if they're not resolved against another type.

Author: tabatkins

css-values-4/Overview.bs

@@ -4400,7 +4400,8 @@ Type Checking</h3>
 					but with a [=percent hint=] set to that other type.
 
 					Otherwise,
-					the [=CSSNumericValue/type=] is «[ "percent" → 1 ]».
+					the [=CSSNumericValue/type=] is «[ "percent" → 1 ]»,
+					with a [=percent hint=] of "percent".
 				: anything else
 				:: The [=calculation’s=] type is failure.
 			</dl>