docs: clarify least-squares intuition in linear regression lesson #909
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Description
This PR improves the explanation of the "Least-Squares" method in the Linear Regression README.
Motivation
While going through the lesson as a student, I found the existing explanation of why we square the residuals to be a bit brief. I have rephrased it to more clearly explain:
I believe this version is more accessible to beginners who are encountering the concept for the first time.
Type of change