Remove stray comment

Author: catamorphism

src/test/compile-fail/private-class-field.rs

@@ -13,12 +13,3 @@ fn main() {
   let nyan : cat = cat(52u, 99);
   assert (nyan.meows == 52u);
 }
-/*
-  other tests:
-  not ok to refer to a private method outside a class
-  ok to refer to private method within a class
-  can't assign to a non-mutable var
-  can't assign to a method
-
-  all the same tests, cross-crate
- */