docs: 补充 R² 负值含义的解释#6860
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在"3.5 扩展评估指标（R²）"节的效果部分，补充了 R² 为负值的含义说明，帮助读者更全面理解该指标。
改动
R² 越接近 1 说明模型解释力越强，若为负值则表明模型比简单均值预测更差测试
文档修改，无代码变更。