minor grammar improvement

Author: cathoderay

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

@@ -100,7 +100,7 @@ Let's say we want the last element of the array.
 
 Some programming languages allow the use of negative indexes for the same purpose, like `fruits[-1]`.
 
-Although, in JavaScript it won't work. The result will be `undefined`, because the index in square brackets is treated literally.
+However, in JavaScript it won't work. The result will be `undefined`, because the index in square brackets is treated literally.
 
 We can explicitly calculate the last element index and then access it: `fruits[fruits.length - 1]`.