Updated test cases documentation

docs/test_cases/t00061.md

@@ -14,7 +14,7 @@ diagrams:
     using_namespace: clanguml::t00061
 ```
 ## Source code
-File t00061.cc
+File `tests/t00061/t00061.cc`
 ```cpp
 #include "include/t00061_a.h"
 #include "include/t00061_b.h"
@@ -28,6 +28,22 @@ struct C {
 }
 }
 ```
+File `tests/t00061/include/t00061_a.h`
+```cpp
+namespace clanguml {
+namespace t00061 {
+struct A { };
+}
+}
+```
+File `tests/t00061/include/t00061_b.h`
+```cpp
+namespace clanguml {
+namespace t00061 {
+struct B { };
+}
+}
+```
 ## Generated PlantUML diagrams
 ![t00061_class](./t00061_class.svg "Paths diagram filter test case")
 ## Generated Mermaid diagrams