doc: add missing properties

Author: kenjis

user_guide_src/source/models/model/005.php

@@ -24,8 +24,19 @@ class UserModel extends Model
     protected $deletedField  = 'deleted_at';
 
     // Validation
-    protected $validationRules    = [];
-    protected $validationMessages = [];
-    protected $skipValidation     = false;
+    protected $validationRules      = [];
+    protected $validationMessages   = [];
+    protected $skipValidation       = false;
     protected $cleanValidationRules = true;
+
+    // Callbacks
+    protected $allowCallbacks = true;
+    protected $beforeInsert   = [];
+    protected $afterInsert    = [];
+    protected $beforeUpdate   = [];
+    protected $afterUpdate    = [];
+    protected $beforeFind     = [];
+    protected $afterFind      = [];
+    protected $beforeDelete   = [];
+    protected $afterDelete    = [];
 }