Edit admin email template for new user registrations
If you look into logintoboggan.module you would see that this message is hard-coded and appended using the hook_mail_alter function and that it's altering the  Welcome (awaiting approval) (user_register_pending_approval_admin) located in admin/config/people/accounts. So if you like to append the data in the middle, you can edit the said email body in the admin page but if you also like to alter the message by logintoboggan then you need to implement hook_mail_alter also.