Update validation class User Guide

Author: bangbangda

user_guide_src/source/libraries/validation.rst

@@ -644,6 +644,12 @@ Available Rules
 
 The following is a list of all the native rules that are available to use:
 
+.. note:: Rule is string,there must be no spaces between the parameters, especially the is_unique rule.
+there can be no spaces before and after ignore_value.
+`is_unique[supplier.name,uuid, $uuid]`   is not ok
+`is_unique[supplier.name,uuid,$uuid ]`   is not ok
+`is_unique[supplier.name,uuid,$uuid]`    is ok
+
 ======================= =========== =============================================================================================== ===================================================
 Rule                    Parameter   Description                                                                                     Example
 ======================= =========== =============================================================================================== ===================================================