Correct an enhanced-enum test to alow setters named values (#1312)

Author: chloestefantsova

LanguageFeatures/Enhanced-Enum/grammar_A10_t04.dart

@@ -10,7 +10,8 @@
 /// declaration.
 ///
 /// @description Check that it's a compile-time error if the enum declaration
-/// contains a static member declaration with the name `values`
+/// contains a static setter with the name `values`, and its argument is not a
+/// supertype of the generated member `values`.
 /// @author [email protected]
 /// @issue 48387
 
@@ -25,9 +26,6 @@ enum E1 {
   e3;
 
   static void set values(int value) {}
-//                ^^^^^^
-// [analyzer] unspecified
-// [cfe] unspecified
 }
 
 enum E2<T> {
@@ -37,9 +35,6 @@ enum E2<T> {
 
   const E2(Object val);
   static void set values(List<E2> value) {}
-//                ^^^^^^
-// [analyzer] unspecified
-// [cfe] unspecified
 }
 
 main() {