update platform::open_folder docs

src/util/platform.hpp

@@ -7,7 +7,7 @@ namespace platform {
     void configure_encoding();
     /// @return environment locale in ISO format ll_CC
     std::string detect_locale();
-    /// @brief Open folder using system file manager application
+    /// @brief Open folder using system file manager asynchronously
     /// @param folder target folder
     void open_folder(const std::filesystem::path& folder);
 }