Fix formatting by removing a comment. (#608)

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

migrate_cpp/cpp_refactoring/var_decl_test.cpp

@@ -93,7 +93,6 @@ TEST_F(VarDeclTest, ConstPointer) {
 }
 
 TEST_F(VarDeclTest, Namespace) {
-  // This is to ensure the 'struct' keyword doesn't get added to the qualified type.
   constexpr char Before[] = R"cpp(
     namespace Foo {
     typedef int Bar;