Fix invalid useCache() example (#10359)

Author: mortenscheel

scheduling.md

@@ -365,10 +365,7 @@ Schedule::command('report:generate')
 You may use the `useCache` method to customize the cache store used by the scheduler to obtain the atomic locks necessary for single-server tasks:
 
 ```php
-Schedule::command('recipes:sync')
-    ->everyThirtyMinutes()
-    ->onOneServer();
-    ->useCache('database');
+Schedule::useCache('database');
 ```
 
 <a name="naming-unique-jobs"></a>