Update dataset link in README.md

[Keithwwa]

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PR Type / PR类型

• Feature（功能新增）
• Bugfix（Bug 修复）
• Docs（文档更新）
• CI/CD（持续集成/持续部署）
• Refactor（代码重构）
• Perf（性能优化）
• Dependency（依赖项更新）
• Test-Cases（测试用例更新）
• Other（其他）

Related Issue | 关联 Issue
Fixes #200

🔍 Motivation / 变更动机

修复失效链接

📝 Modification / 修改内容

关联有效数据集文档链接

📐 Associated Test Results / 关联测试结果

✅ Checklist / 检查列表

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• Pre-commit or other linting tools are used to fix the potential lint issues. / 使用预提交或其他 linting 工具来修复潜在的 lint 问题。
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• The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness. / 此拉取请求中的修改已完全由单元测试覆盖。如果不是，请添加更多单元测试以确保正确性。
• All relevant documentation (API docs, docstrings, example tutorials) has been updated to reflect these changes. / 所有相关文档（API 文档、文档字符串、示例教程）已更新以反映这些更改。

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects. / 如果此拉取请求对下游或其他相关项目有潜在影响，应在那些项目中测试此 PR。
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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on improving the project's documentation by resolving an invalid link within the README.md file. The change ensures that users can correctly access information about open-source datasets. Additionally, a minor formatting adjustment was made to the README.md file to maintain consistency.

Highlights

• Documentation Link Update: The broken link for '开源数据集' (open-source datasets) in README.md has been corrected to point to the valid documentation path.
• File Formatting: A missing newline character was added at the end of the README.md file to ensure proper formatting.

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[gemini-code-assist]

Code Review

本次拉取请求更新了 README.md 文件中一个指向数据集文档的失效链接，并确保了文件以换行符结尾。这些是对文档质量有益的改进。经过审核，本次修改内容无误，未发现其他问题。