Typo in Calculus Chapter 3

[Rasmion]

Duplicate "the" (but the the area)

3Blue1Brown.com/public/content/lessons/2017/derivatives-power-rule/index.mdx

Line 277 in a92bf93

 The small nudge $dx$ changes the width of the rectangle, but the the area must still be $1$, so the area gained must cancel out with the area lost. This gives us the expression below. 

[Kurt Bruns]

Thanks for pointing this out! It will be fixed once #353 is merged with the main branch.