docs: 补充偏置未更新的数学影响说明#6862
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线性回归文档增加运行效果图
线性回归文档增加运行效果图
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在"2.2 偏置项从未被更新"节末尾，补充了该 Bug 的数学本质——强制回归直线通过原点导致欠拟合。
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从数学上看，未更新偏置的模型相当于强制回归直线通过原点，对非零均值数据几乎必然欠拟合测试
文档修改，无代码变更。