fix correlation function name

GUI/Model/Sample/RoughnessCatalog.cpp

@@ -38,7 +38,7 @@ UiInfo RoughnessCatalog::uiInfo(Type type)
     case Type::None:
         return {"None", "", ""};
     case Type::Basic:
-        return {"Basic", "Stretched exponential lateral correlation function", ""};
+        return {"Basic", "Fractal lateral correlation function", ""};
     }
     ASSERT_NEVER;
 }