Update compiler-error-c2526.md

There's nothing wrong with the previous example. We just try to be as pedantic as possible because we are focusing more lately on newcomers to C++

Author: TylerMSFT

docs/error-messages/compiler-errors-2/compiler-error-c2526.md

@@ -21,6 +21,6 @@ class A {};
 
 extern "C" A<int> func()   // C2526
 {
-    return {};
+    return A<int>();
 }
 ```