Fix typo in the polymorphism article

content/blog/10_compiler_polymorphism.md

@@ -58,7 +58,7 @@ __generalization__ and __instantiation__. It's been quite a while since the last
 to present a table with these new rules, as well as all of the ones that we
 {{< sidenote "right" "rules-note" "previously used." >}}
 The rules aren't quite the same as the ones we used earlier;
-note that \\(\sigma\\) is used in place of \\(\tau\\) in the first rule,
+note that \(\sigma\) is used in place of \(\tau\) in the first rule,
 for instance. These changes are slight, and we'll talk about how the
 rules work together below.
 {{< /sidenote >}} I will also give a quick