Docs fix type singleType findOne (#8764)

* fix: typo find instead of findone for singleType

Signed-off-by: Fadhil Ahmad <fadzbobby95@gmail.com>

* refactor: remove query obj for single type

Signed-off-by: Fadhil Ahmad <fadzbobby95@gmail.com>

docs/v3.x/concepts/services.md

@@ -343,7 +343,7 @@ module.exports = {
         model: 'restaurant',
         // if you are using a plugin's model you will have to add the `plugin` key (plugin: 'users-permissions')
       });
-      return this.findOne({ id: entry.id });
+      return this.find();
     }
 
     return entry;