updated Doxyfile

properly close all doxygen groups
fixed remaining doxygen warnings

src/libstrongswan/plugins/des/des_crypter.h

@@ -46,4 +46,4 @@ struct des_crypter_t {
 des_crypter_t *des_crypter_create(encryption_algorithm_t algo);
 
 
-#endif /* DES_CRYPTER_H_ @}*/
+#endif /** DES_CRYPTER_H_ @}*/

src/libstrongswan/plugins/des/des_plugin.h

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