mention the Organization & Sub-accounts feature requirement for deleting a sub-account

Author: oshchyhol

mailtrap/api/resources/sub_accounts.py

@@ -33,7 +33,8 @@ def create(self, sub_account_params: CreateSubAccountParams) -> SubAccount:
     def delete(self, sub_account_id: int) -> DeletedObject:
         """
         Delete a sub account of the organization. Requires organization
-        admin permissions.
+        admin permissions. The organization must also have the Organization
+        & Sub-accounts feature enabled.
 
         The sub account and all of its data are removed permanently and cannot
         be restored. Deleting the organization's last sub account also deletes