And another fix to mass assignment example

docs/guide/model.md

@@ -240,7 +240,7 @@ $attributes = [
 	'title' => 'Massive assignment example',
 	'body' => 'Never allow assigning attributes that are not meant to be assigned.',
 ];
-$post->attributes = $attributes;
+$postForm->attributes = $attributes;
 ```
 
 In the code above we're assigning corresponding data to model attributes named as array keys. The key difference from mass