correct constraint name

Author: ogobrecht

customer_orders/co_constraints.sql

@@ -62,5 +62,5 @@ alter table inventory add constraint inventory_store_product_u unique (store_id,
 alter table inventory add constraint inventory_store_id_fk 
    foreign key (store_id) references stores (store_id);
 
-alter table inventory add constraint shipments_product_id_fk 
+alter table inventory add constraint inventory_product_id_fk 
    foreign key (product_id) references products (product_id);