Updated test cases documentation

docs/test_cases/t40003.md

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+# t40003 - Dependants and dependencies include diagram filter test
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t40003_include:
+    type: include
+    # Provide the files to parse in order to look
+    # for #include directives
+    glob:
+      - ../../tests/t40003/include/**/*.h
+      - ../../tests/t40003/src/**/*.cc
+    # Render the paths relative to this directory
+    relative_to: ../../tests/t40003
+    include:
+      # Include only files belonging to these paths
+      dependants:
+        - ../../tests/t40003/include/dependants/t1.h
+      dependencies:
+        - ../../tests/t40003/src/dependencies/t2.cc
+    plantuml:
+      before:
+        - "' t40003 test include diagram"
+```
+## Source code
+## Generated UML diagrams
+![t40003_include](./t40003_include.svg "Dependants and dependencies include diagram filter test")