Applied google-readability-namespace-comments clang-tidy fixes

src/class_diagram/visitor/translation_unit_visitor.cc

@@ -2172,4 +2172,4 @@ translation_unit_visitor::get_ast_local_id(int64_t local_id) const
 
     return local_ast_id_map_.at(local_id);
 }
-}
+} // namespace clanguml::class_diagram::visitor

src/class_diagram/visitor/translation_unit_visitor.h

@@ -255,4 +255,4 @@ private:
             common::model::access_t>>
         anonymous_struct_relationships_;
 };
-}
+} // namespace clanguml::class_diagram::visitor