Update doc (#4077)

Author: harish-sethuraman

beta/src/pages/learn/updating-arrays-in-state.md

@@ -152,7 +152,7 @@ setArtists([
 ]);
 ```
 
-In this way, spread can do the job of both `push()` by adding to the beginning of an array and `unshift()` by adding to the end of an array. Try it in the sandbox above!
+In this way, spread can do the job of both `push()` by adding to the end of an array and `unshift()` by adding to the beginning of an array. Try it in the sandbox above!
 
 ### Removing from an array