Update IPN docs to reflect simplified approach on core PR 13869
Created by: MegaphoneJon
https://github.com/civicrm/civicrm-core/pull/13869 simplifies the documentation available for setting the IPN URL. Once it's merged this page should be updated.
Created by: MegaphoneJon
https://github.com/civicrm/civicrm-core/pull/13869 simplifies the documentation available for setting the IPN URL. Once it's merged this page should be updated.