Except does not work as in the documentation

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/17/queries-union.html
Description:

The current documentation does not give the right syntax for using the
EXCEPT in a query.
This is the error when I ran the below:
select appt_id from wayfinder.patient_details where create_timestamp between
('2025-02-24 00:00:00' and '2025-02-25 00:00:00')
EXCEPT
select appt_id from wayfinder.appointment_details where create_timestamp
between ('2025-02-24 00:00:00' and '2025-02-25 00:00:00')
ERROR:  syntax error at or near "EXCEPT"
LINE 2: EXCEPT
        ^
SQL state: 42601
Character: 128