Updated test case docs

docs/test_cases/t00034.md

@@ -13,6 +13,9 @@ diagrams:
     include:
       namespaces:
         - clanguml::t00034
+    plantuml:
+      after:
+        - "@A(R) --> @A(A) : +la"
 
 ```
 ## Source code
@@ -45,7 +48,8 @@ template <> struct lift_void<void> {
 // TODO: This is a shortcoming of libclang which parses the type of lift_void_t
 // alias as unexposed, i.e. no actual reference to T can be inferred without
 // manually parsing the string 'typename lift_void<T>::type'
-// For now, this test validates that the visitor does not crash
+// For now, this test validates that the visitor does not crash, the reference
+// between R and A has to be provided in the configuration file
 //
 template <typename T> using lift_void_t = typename lift_void<T>::type;