updated Doxyfile

properly close all doxygen groups
fixed remaining doxygen warnings

src/libstrongswan/plugins/curl/curl_fetcher.h

@@ -44,4 +44,4 @@ struct curl_fetcher_t {
  */
 curl_fetcher_t *curl_fetcher_create();
 
-#endif /* CURL_FETCHER_H_ @}*/
+#endif /** CURL_FETCHER_H_ @}*/

src/libstrongswan/plugins/curl/curl_plugin.h

@@ -44,4 +44,4 @@ struct curl_plugin_t {
  */
 plugin_t *plugin_create();
 
-#endif /* CURL_PLUGIN_H_ @}*/
+#endif /** CURL_PLUGIN_H_ @}*/