Minor typo in the r-squared definition

[amirdib]

Hi there,

This latex equation

aws-mlu-explain/code/linear-regression/src/Components/MeanSquaredError.svelte

Line 76 in 8e3fcf6

`\\begin{aligned} R^2 = 1 - \\frac{\\Sigma^{n}_{i=1}(y_i - \\hat{y_i})^2 }{\\Sigma^{n}_{i=1}(y_i - \\bar{y_i})^2 } \\end{aligned}`,

should be (removing the i sub for the mean in the r^2 metric definition)

 `\\begin{aligned} R^2 = 1 - \\frac{\\Sigma^{n}_{i=1}(y_i - \\hat{y_i})^2 }{\\Sigma^{n}_{i=1}(y_i - \\bar{y})^2 }  \\end{aligned}`, 

[jwilber]

Fixed - thank you!