Update article.md

Author: Matt "Bacon" Fellenz

1-js/02-first-steps/16-javascript-specials/article.md

@@ -57,7 +57,7 @@ To fully enable all features of modern JavaScript, we should start scripts with
 
 The directive must be at the top of a script or at the beginning of a function.
 
-Without `"use strict"`, everything still works, but some features behave in old-fasion, "compatible" way. We'd generally prefer the modern behavior.
+Without `"use strict"`, everything still works, but some features behave in old-fashion, "compatible" way. We'd generally prefer the modern behavior.
 
 Some modern features of the language (like classes that we'll study in the future) enable strict mode implicitly.