Possibly misleading documentation of Template Patterns for Date/Time Formatting

Hi,

on the official docs
https://www.postgresql.org/docs/9.6/functions-formatting.html see the table
9-24 and Pattern "Q". The doc (for version 9.6) says:

quarter (ignored by to_date and to_timestamp)

All the later versions of the doc (10, 11, 12) miss the "ignored" note
leading the user to think that it should work but it doesn't, at least on
12.1:

# select TO_DATE( '2012-4', 'YYYY-Q' );
to_date
------------
2012-01-01
(1 row)

Is this an expected behaviour, i.e. the documentation is just wrong or it
really should work?

Regards,

David Kubecka