Chore: Fix typo (styleguidist#1311)

Author: kopax

src/loaders/utils/client/requireInRuntime.js

@@ -5,7 +5,7 @@ type RequireMap = { [filepath: string]: Module };
 
 /**
  * Return module from a given map (like {react: require('react')}) or throw.
- * We allow to require modules only from Markdown examples (won’t work dynamically becasue we need to know all required
+ * We allow to require modules only from Markdown examples (won’t work dynamically because we need to know all required
  * modules in advance to be able to bundle them with the code).
  */
 export default function requireInRuntime(requireMap: RequireMap, filepath: string): Module {