fix typo, remove pleonasm

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

@@ -255,7 +255,7 @@ alert( arr.includes(1) ); // true
 
 Please note that `indexOf` uses the strict equality `===` for comparison. So, if we look for `false`, it finds exactly `false` and not the zero.
 
-If we want to check if `item` exists in the array, and don't need the exact index, then `arr.includes` is preferred.
+If we want to check if `item` exists in the array, and don't need the index, then `arr.includes` is preferred.
 
 The method [arr.lastIndexOf](mdn:js/Array/lastIndexOf) is the same as `indexOf`, but looks for from right to left.
 
@@ -338,8 +338,6 @@ alert(users.findIndex(user => user.name == 'John')); // 0
 alert(users.findLastIndex(user => user.name == 'John')); // 3
 ```
 
-
-
 ### filter
 
 The `find` method looks for a single (first) element that makes the function return `true`.