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/last.md

@@ -2,7 +2,7 @@
 
 Returns the last element in an array.
 
-Use `arr.length - 1` to compute index of the last element of the given array and returning it.
+Use `arr.length - 1` to compute the index of the last element of the given array and returning it.
 
 ```js
 const last = arr => arr[arr.length - 1];