docs: perfect validateTrigger description (ant-design#30182)

components/form/index.zh-CN.md

@@ -34,7 +34,7 @@ cover: https://gw.alipayobjects.com/zos/alicdn/ORmcdeaoO/Form.svg
 | scrollToFirstError | 提交失败自动滚动到第一个错误字段 | boolean \| [Options](https://github.com/stipsan/scroll-into-view-if-needed/tree/ece40bd9143f48caf4b99503425ecb16b0ad8249#options) | false |  |
 | size | 设置字段组件的尺寸（仅限 antd 组件） | `small` \| `middle` \| `large` | - |  |
 | validateMessages | 验证提示模板，说明[见下](#validateMessages) | [ValidateMessages](https://github.com/react-component/field-form/blob/master/src/utils/messages.ts) | - |  |
-| validateTrigger | 统一设置字段校验规则 | string \| string\[] | `onChange` | 4.3.0 |
+| validateTrigger | 统一设置字段触发验证的时机 | string \| string\[] | `onChange` | 4.3.0 |
 | wrapperCol | 需要为输入控件设置布局样式时，使用该属性，用法同 labelCol | [object](/components/grid/#Col) | - |  |
 | onFieldsChange | 字段更新时触发回调事件 | function(changedFields, allFields) | - |  |
 | onFinish | 提交表单且数据验证成功后回调事件 | function(values) | - |  |