docs: 修改picker文档props选中默认项

[JimboXie]

这个 PR 做了什么? (简要描述所做更改)

这个 PR 是什么类型? (至少选择一个)

• feat: 新特性提交
• fix: bug 修复
• docs: 文档改进
• style: 组件样式/交互改进
• type: 类型定义更新
• perf: 性能、包体积优化
• refactor: 代码重构、代码风格优化
• test: 测试用例
• chore(deps): 依赖升级
• chore(demo): 演示代码改进
• chore(locale): 国际化改进
• chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• NutUI H5 @nutui/nutui
• NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• 自测 Vite 脚手架使用 测试仓库
• 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

Summary by CodeRabbit

• 文档更新
  • 更新了Picker组件的文档，将参数名称从v-model:value更改为v-model，简化了默认选中项的绑定语法，更符合Vue.js的双向数据绑定标准。

[coderabbitai]

Walkthrough

此次更改涉及Picker组件文档中的参数名称修改，将v-model:value更改为v-model。此更改简化了默认选中项的绑定语法，使其与标准的Vue.js双向数据绑定实践保持一致。文档的其他部分保持不变，继续维护其他参数的描述和类型。

Changes

文件路径	更改摘要
src/packages/__VUE/picker/doc.taro.md	将Picker文档中的v-model:value重命名为v-model

Possibly related PRs

• feat(picker): 为当前选中的 picker-roller-item 新增类名 #3127: 此PR涉及Picker组件，与主要PR中关于Picker文档的修改直接相关。

Poem

兔子跳跃在草地上，
新语法让心欢畅。
绑定简单如春风，
Vue的世界更辉煌。
文档清晰如晨光，
兔子欢呼声不断！ 🐇✨

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Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 07367de and f16b0f0.

Files selected for processing (1)

• src/packages/__VUE/picker/doc.taro.md (1 hunks)

Files skipped from review due to trivial changes (1)

• src/packages/__VUE/picker/doc.taro.md

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