minor fixes

Author: iliakan

1-js/05-data-types/04-array/article.md

@@ -429,7 +429,7 @@ alert( "1" + 1 ); // "11"
 alert( "1,2" + 1 ); // "1,21"
 ```
 
-## Dont compare arrays with ==
+## Don't compare arrays with ==
 
 Arrays in JavaScript, unlike some other programming languages, shouldn't be compared with operator `==`.