Doc: Specify the interaction of publish_generated_columns with column list.

Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CAHut+PtnjLiNFFh-3f9cXH0wnwqjdkTjQNbVmZdZ1y+zKt_PPg@mail.gmail.com

doc/src/sgml/ref/create_publication.sgml

@@ -89,10 +89,12 @@ CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
 
      <para>
       When a column list is specified, only the named columns are replicated.
-      The column list can contain stored generated columns as well. If no
+      The column list can contain stored generated columns as well. If the
-      column list is specified, all table columns (except generated columns)
+      column list is omitted, the publication will replicate all non-generated
-      are replicated through this publication, including any columns added
+      columns (including any added in the future) by default. Stored generated
-      later. It has no effect on <literal>TRUNCATE</literal> commands. See
+      columns can also be replicated if <literal>publish_generated_columns</literal>
+      is set to <literal>stored</literal>. Specifying a column list has no
+      effect on <literal>TRUNCATE</literal> commands. See
       <xref linkend="logical-replication-col-lists"/> for details about column
       lists.
      </para>