docs: Update Form custom validator doc (#15040)

examples/docs/en-US/form.md

@@ -382,7 +382,7 @@ This example shows how to customize your own validation rules to finish a two-fa
 :::
 
 :::tip
-See more advanced usage of validation rules at [async-validator](https://github.com/yiminghe/async-validator)。
+Custom validate callback function must be called. See more advanced usage at [async-validator](https://github.com/yiminghe/async-validator).
 :::
 
 ### Delete or add form items dynamically

examples/docs/es/form.md

@@ -389,7 +389,7 @@ Este ejemplo muestra cómo personalizar sus propias reglas de validación para f
 :::
 
 :::tip
-Ver más sobre el uso avanzado de la validacion de reglas en [async-validator](https://github.com/yiminghe/async-validator).。
+Custom validate callback function must be called. See more advanced usage at [async-validator](https://github.com/yiminghe/async-validator).
 :::
 
 ### Eliminar o agregar validaciones dinamicamente

examples/docs/fr-FR/form.md

@@ -382,7 +382,7 @@ Cet exemple montre comment vous pouvez personnaliser vos règles de validation p
 :::
 
 :::tip
-See more advanced usage of validation rules at [async-validator](https://github.com/yiminghe/async-validator)。
+Custom validate callback function must be called. See more advanced usage at [async-validator](https://github.com/yiminghe/async-validator).
 :::
 
 ### Ajouter ou supprimer des champs dynamiquement

examples/docs/zh-CN/form.md

@@ -378,7 +378,7 @@ W3C 标准中有如下[规定](https://www.w3.org/MarkUp/html-spec/html-spec_8.h
 :::
 
 :::tip
-校验规则更多高级用法可参考 [async-validator](https://github.com/yiminghe/async-validator)。
+自定义校验 callback 必须被调用。 更多高级用法可参考 [async-validator](https://github.com/yiminghe/async-validator)。
 :::
 
 ### 动态增减表单项