Add explaination an recommendations

application/config/aauth.php

@@ -64,6 +64,9 @@ defined('BASEPATH') OR exit('No direct script access allowed');
 | 	['verification_link']              	Link for verification without site_url or base_url
 | 	['reset_password_link']            	Link for reset_password without site_url or base_url
 |
+|	['hash']							Name of selected hashing algorithm (e.g. "md5", "sha256", "haval160,4", etc..)
+|										Please, run hash_algos() for know your all supported algorithms
+|
 */
 $config_aauth = array();