Update formatting

snippets/initial.md

@@ -7,7 +7,7 @@ lastUpdated: 2020-11-03T21:46:13+02:00
 
 Returns all the elements of an array except the last one.
 
-- Use `Array.prototype.slice(0, -1)` to return all but the last element of the array.
+- Use `Array.prototype.slice()` to return all but the last element of the array.
 
 ```js
 const initial = arr => arr.slice(0, -1);