Updated test cases documentation

docs/test_cases/t00038.md

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+# t00038 - Template instantiation with unexposed nested templates
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t00038_class:
+    type: class
+    generate_packages: true
+    glob:
+      - ../../tests/t00038/t00038.cc
+    using_namespace:
+      - clanguml::t00038
+    include:
+      namespaces:
+        - clanguml::t00038
+```
+## Source code
+File t00038.cc
+```cpp
+#include <map>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+namespace clanguml {
+namespace t00038 {
+
+enum class property_t { property_a, property_b, property_c };
+
+struct A {
+};
+struct B {
+};
+struct C {
+};
+
+struct key_t {
+    std::string key;
+};
+
+template <typename T> struct map;
+
+template <>
+struct map<std::integral_constant<property_t, property_t::property_a>> : A {
+};
+
+template <>
+struct map<
+    std::vector<std::integral_constant<property_t, property_t::property_b>>>
+    : B {
+};
+
+template <>
+struct map<std::map<key_t,
+    std::vector<std::integral_constant<property_t, property_t::property_c>>>>
+    : C {
+};
+
+} // namespace t00038
+} // namespace clanguml
+
+```
+## Generated UML diagrams
+![t00038_class](./t00038_class.svg "Template instantiation with unexposed nested templates")