Updated test cases documentation

docs/test_cases/t00039.md

@@ -14,6 +14,9 @@ diagrams:
     include:
       subclasses:
         - clanguml::t00039::A
+        - clanguml::t00039::C
+        - clanguml::t00039::D
+        - clanguml::t00039::E
         - clanguml::t00039::ns3::F<T>
       relationships:
         - inheritance
@@ -27,11 +30,29 @@ namespace clanguml::t00039 {
 struct B {
 };
 
+struct C {
+};
+
+struct D {
+};
+
+struct E {
+};
+
 namespace ns1 {
 struct BB : public B {
 };
 } // namespace ns1
 
+struct CD : public C, public D {
+};
+
+struct DE : public D, public E {
+};
+
+struct CDE : public C, public D, public E {
+};
+
 struct A {
 };