docs: lock vite-plugin-style-import version (#10027)

packages/vant/docs/markdown/quickstart.en-US.md

@@ -99,7 +99,7 @@ If you are using vite, please use [vite-plugin-style-import](https://github.com/
 #### 1. Install Plugin
 
 ```bash
-npm i vite-plugin-style-import -D
+npm i vite-plugin-style-import@1.2.0 -D
 ```
 
 #### 2. Configure Plugin

packages/vant/docs/markdown/quickstart.zh-CN.md

@@ -100,7 +100,7 @@ pnpm add vant@3
 #### 1. 安装插件
 
 ```bash
-npm i vite-plugin-style-import -D
+npm i vite-plugin-style-import@1.2.0 -D
 ```
 
 #### 2. 配置插件

packages/vant/src/form/README.md

@@ -509,7 +509,7 @@ export default {
 
 | Key | Description | Type |
 | --- | --- | --- |
-| required | Whether to be a required field | _boolean_ |
+| required | Whether to be a required field, the value is not allowed to be empty string, empty array, `undefined`, `null` | _boolean_ |
 | message | Error message | _string \| (value, rule) => string_ |
 | validator | Custom validator | _(value, rule) => boolean \| string \| Promise_ |
 | pattern | Regex pattern | _RegExp_ |

packages/vant/src/form/README.zh-CN.md

@@ -545,7 +545,7 @@ export default {
 
 | 键名 | 说明 | 类型 |
 | --- | --- | --- |
-| required | 是否为必选字段 | _boolean_ |
+| required | 是否为必选字段，当值为空字符串、空数组、`undefined`、`null` 时，校验不通过 | _boolean_ |
 | message | 错误提示文案 | _string \| (value, rule) => string_ |
 | validator | 通过函数进行校验 | _(value, rule) => boolean \| string \| Promise_ |
 | pattern | 通过正则表达式进行校验 | _RegExp_ |