Fix misspeling

user.format - not exist in the code bellow.
Probably you mean  `worker.slow`

Author: nkhristinin

1-js/06-advanced-functions/09-call-apply-decorators/article.md

@@ -70,7 +70,7 @@ To summarize, there are several benefits of using a separate `cachingDecorator`
 
 The caching decorator mentioned above is not suited to work with object methods.
 
-For instance, in the code below `user.format()` stops working after the decoration:
+For instance, in the code below `worker.slow()` stops working after the decoration:
 
 ```js run
 // we'll make worker.slow caching