Fixed typo in docs/ref/models/querysets.txt

docs/ref/models/querysets.txt

@@ -923,7 +923,7 @@ For example, suppose you have these models::
         def __str__(self):              # __unicode__ on Python 2
             return "%s (%s)" % (
                 self.name,
-                ", ".join(topping.name or topping in self.toppings.all()),
+                ", ".join(topping.name for topping in self.toppings.all()),
             )
 
 and run::