docs: update previousOf example

readme.md

@@ -170,7 +170,7 @@ Here are the custom array methods which are available for you to use:
   Usage: `array.previousOf('item')`
   ```js
   array = ['Tag 1', 'Tag 2', 'Tag 3', 'Tag 4']
-  array.nextOf('Tag 2') // returns 'Tag 1'
+  array.previousOf('Tag 2') // returns 'Tag 1'
   ```
 
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