Update array methods article

Update array methods article

Author: zhangbg

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

@@ -10,8 +10,8 @@ We already know methods that add and remove items from the beginning or the end:
 
 - `arr.push(...items)` -- adds items to the end,
 - `arr.pop()` -- extracts an item from the end,
-- `arr.shift()` -- extracts an item from the beginning.
-- `arr.unshift(...items)` -- adds items to the beginning,
+- `arr.shift()` -- extracts an item from the beginning,
+- `arr.unshift(...items)` -- adds items to the beginning.
 
 Here are few others.