(try to) fix doc comment

godot-macros/src/lib.rs

@@ -686,6 +686,12 @@ pub fn derive_godot_class(input: TokenStream) -> TokenStream {
 /// For implementation reasons, subsequent impl blocks must have the key 'secondary'. There is no difference between implementing all functions in one block or splitting them up between multiple blocks.
 /// ```no_run
 /// # use godot::prelude::*;
+/// # #[derive(GodotClass)]
+/// # #[class(init)]
+/// # struct MyStruct {
+/// #     // Virtual functions require base object.
+/// #     base: Base<RefCounted>,
+/// # }
 /// #[godot_api]
 /// impl MyStruct {
 ///     #[func]