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extremities: Fix typo "cubic -> quadratic" (#330)

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Co-authored-by: Alexander D'hoore <alexander.dhoore@summa.com>
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docs/chapters/extremities/content.en-GB.md
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@@ -4,7 +4,7 @@ Now that we understand (well, superficially anyway) the component functions, we
### Quadratic curves: linear derivatives.
The derivative of a quadratic Bézier curve is a linear Bézier curve, interpolating between just two terms, which means finding the solution for "where is this line 0" is effectively trivial by rewriting it to a function of `t` and solving. First we turn our cubic Bézier function into a quadratic one, by following the rule mentioned at the end of the [derivatives section](#derivatives):
The derivative of a quadratic Bézier curve is a linear Bézier curve, interpolating between just two terms, which means finding the solution for "where is this line 0" is effectively trivial by rewriting it to a function of `t` and solving. First we turn our quadratic Bézier function into a linear one, by following the rule mentioned at the end of the [derivatives section](#derivatives):
\[
\begin{aligned}