修复loading组件示例代码中文标点符号、img-cropper组件示例代码标签缺失

[kqswzhyb]

🤔 这个 PR 的性质是？(至少选择一个)

• [ ] 日常 bug 修复
• [ ] 新特性提交
• [ ] 站点、文档改进
• [x] 演示代码改进
• [ ] 组件样式/交互改进
• [ ] TypeScript 定义更新
• [ ] CI/CD 改进
• [ ] 包体积优化
• [ ] 性能优化
• [ ] 功能增强
• [ ] 国际化改进
• [ ] 代码重构
• [ ] 代码风格优化
• [ ] 测试用例
• [ ] 分支合并
• [ ] 其他改动（是关于什么的改动？）

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⚠️ 请自检并全部勾选全部选项。⚠️

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

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