Move spaces from before comments to within comments

tests/language/mixin_invalid_inheritance1_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class C<T> extends Object
-  with Malformed  /// 01: compile-time error
-  with T  /// 02: compile-time error
-  with T<int>  /// 03: compile-time error
+  with Malformed // /// 01: compile-time error
+  with T // /// 02: compile-time error
+  with T<int> // /// 03: compile-time error
 {}
 
 main() => new C<C>();