Fix typos in spaces

Fix typo to fit the context

Fix typo add space

Fix small typo

Fix small typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Update tail.md

Fix typo

Fix small typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix small typo

Fix typo

Fix small typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

Fix typo

snippets/initial.md

@@ -2,7 +2,7 @@
 
 Returns all the elements of an array except the last one.
 
-Use `arr.slice(0,-1)`to return all but the last element of the array.
+Use `arr.slice(0,-1)` to return all but the last element of the array.
 
 ```js
 const initial = arr => arr.slice(0, -1);