fix: escape inline subscripts on diagonal Ramsey constant page

constants/17a.md

@@ -2,7 +2,7 @@
 
 ## Description of constant
 
-$C_{17}$ is the limit (if it exists) of $R(k)^{1/k}$ as $k \to \infty$, where the diagonal Ramsey number $R(k)$ is the smallest integer $n$ such that every red/blue colouring of the edges of the complete graph $K_{n}$ contains a monochromatic copy of $K_{k}$.
+$C\_{17}$ is the limit (if it exists) of $R(k)^{1/k}$ as $k \to \infty$, where the diagonal Ramsey number $R(k)$ is the smallest integer $n$ such that every red/blue colouring of the edges of the complete graph $K\_{n}$ contains a monochromatic copy of $K\_{k}$.
 
 ## Known upper bounds