DOCS - create publication (tweak for generated columns)

Hi,

While re-reading documentation about logical replication of generated
columns, I came across this paragraph in the CREATE PUBLICATION ...
FOR TABLE description [1].

----
When a column list is specified, only the named columns are
replicated. The column list can contain stored generated columns as
well. If no column list is specified, all table columns (except
generated columns) are replicated through this publication, including
any columns added later. It has no effect on TRUNCATE commands. See
Section 29.5 for details about column lists.
----

That "except generated columns" part is not strictly correct because
it fails to account for the 'publish_generated_columns' parameter.
I've suggested a more accurate description below.

SUGGESTION
----
When a column list is specified, only the named columns are
replicated. Stored generated columns may be included in the list.
Specifying a column list has no effect on TRUNCATE commands. See
Section 29.5 for details about column lists. If no column list is
specified, all table columns are replicated through this publication,
including any columns added later. Generated columns are included in
this case only if publish_generated_columns is set to stored.
----

I've attached a patch to implement this suggested wording.

Thoughts?

======
[1] https://www.postgresql.org/docs/devel/sql-createpublication.html#SQL-CREATEPUBLICATION-PARAMS-FOR-TABLE

Kind Regards,
Peter Smith.
Fujitsu Australia