style(textarea): 修复示例 demo 的半角标点符号

[syxysszyw]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#689

💡 需求背景和解决方案

📝 更新日志

• fix(组件名称): 处理问题或特性描述 ...

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

[codecov-commenter]

Codecov Report

Merging #1210 (e280621) into develop (c4c5d1d) will increase coverage by 0.11%.
The diff coverage is 68.94%.

@@             Coverage Diff             @@
##           develop    #1210      +/-   ##
===========================================
+ Coverage    60.18%   60.29%   +0.11%     
===========================================
  Files          959      968       +9     
  Lines        16979    17116     +137     
  Branches      3906     3925      +19     
===========================================
+ Hits         10218    10320     +102     
- Misses        6761     6796      +35     

Impacted Files	Coverage Δ
src/_util/useAnimation.ts	100.00% <ø> (ø)
src/_util/useClickOutside.ts	86.36% <ø> (ø)
src/_util/useCommonClassName.ts	100.00% <ø> (ø)
src/_util/useRipple.ts	26.76% <ø> (ø)
src/affix/Affix.tsx	85.93% <ø> (ø)
src/anchor/AnchorItem.tsx	85.71% <ø> (ø)
src/avatar/AvararGroup.tsx	92.00% <ø> (ø)
src/avatar/Avatar.tsx	95.74% <ø> (ø)
src/badge/Badge.tsx	100.00% <ø> (ø)
src/breadcrumb/Breadcrumb.tsx	100.00% <ø> (ø)
... and 174 more

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