Remove redundant codes in section 16.4 of getting_started.md

Author: GaiheiluKamei

guides/source/getting_started.md

@@ -2335,7 +2335,6 @@ Notifications module.
 class Product < ApplicationRecord
   include Notifications
 
-  has_many :subscribers, dependent: :destroy
   has_one_attached :featured_image
   has_rich_text :description