Rearranged expanded sums/prods to match Wikipedia

This form also just seems a bit more readable, with the expansion being
more a sidenote than relevant to the core math.

README.md

@@ -143,8 +143,8 @@ points at $g^i$ where $i < n$ like so:
 
 <p align="center">
 <img
-    alt="P(x) = \left(x-1\right)\left(x-g\right)\cdots\left(x-g^{n-1}\right) = \prod_{i=0}^{n-1} \left(x - g^i\right)"
-    src="https://latex.codecogs.com/svg.image?P%28x%29%20%3d%20%5cleft%28x%2d%31%5cright%29%5cleft%28x%2dg%5cright%29%5ccdots%5cleft%28x%2dg%5e%7bn%2d%31%7d%5cright%29%20%3d%20%5cprod_%7bi%3d%30%7d%5e%7bn%2d%31%7d%20%5cleft%28x%20%2d%20g%5ei%5cright%29"
+    alt="P(x) = \prod_{i=0}^{n-1} \left(x - g^i\right) = \left(x-1\right)\left(x-g\right)\cdots\left(x-g^{n-1}\right)"
+    src="https://latex.codecogs.com/svg.image?P%28x%29%20%3d%20%5cprod_%7bi%3d%30%7d%5e%7bn%2d%31%7d%20%5cleft%28x%20%2d%20g%5ei%5cright%29%20%3d%20%5cleft%28x%2d%31%5cright%29%5cleft%28x%2dg%5cright%29%5ccdots%5cleft%28x%2dg%5e%7bn%2d%31%7d%5cright%29"
 >
 </p>
 
@@ -210,8 +210,8 @@ to our original codeword, where $E(x)$ contains up to $e$ non-zero terms:
 
 <p align="center">
 <img
-    alt="E(x) = E_{j_0} x^{j_0} + E_{j_1} x^{j_1} + \cdots + E_{j_{e-1}} x^{j_{e-1}} = \sum_{j \in E} E_j x^j"
-    src="https://latex.codecogs.com/svg.image?E%28x%29%20%3d%20E_%7bj_%30%7d%20x%5e%7bj_%30%7d%20%2b%20E_%7bj_%31%7d%20x%5e%7bj_%31%7d%20%2b%20%5ccdots%20%2b%20E_%7bj_%7be%2d%31%7d%7d%20x%5e%7bj_%7be%2d%31%7d%7d%20%3d%20%5csum_%7bj%20%5cin%20E%7d%20E_j%20x%5ej"
+    alt="E(x) = \sum_{j \in E} E_j x^j = E_{j_0} x^{j_0} + E_{j_1} x^{j_1} + \cdots + E_{j_{e-1}} x^{j_{e-1}}"
+    src="https://latex.codecogs.com/svg.image?E%28x%29%20%3d%20%5csum_%7bj%20%5cin%20E%7d%20E_j%20x%5ej%20%3d%20E_%7bj_%30%7d%20x%5e%7bj_%30%7d%20%2b%20E_%7bj_%31%7d%20x%5e%7bj_%31%7d%20%2b%20%5ccdots%20%2b%20E_%7bj_%7be%2d%31%7d%7d%20x%5e%7bj_%7be%2d%31%7d%7d"
 >
 </p>