doc: Fix misleading synopsis for CREATE/ALTER PUBLICATION.

The documentation for CREATE/ALTER PUBLICATION previously showed:

        [ ONLY ] table_name [ * ] [ ( column_name [, ... ] ) ] [ WHERE ( expression ) ] [, ... ]

to indicate that the table/column specification could be repeated.
However, placing [, ... ] directly after a multi-part construct was
misleading and made it unclear which portion was repeatable.

This commit introduces a new term, table_and_columns, to represent:

        [ ONLY ] table_name [ * ] [ ( column_name [, ... ] ) ] [ WHERE ( expression ) ]

and updates the synopsis to use:

        table_and_columns [, ... ]

which clearly identifies the repeatable element.

Backpatched to v15, where the misleading syntax was introduced.

Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Chao Li <lic@highgo.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/CAHut+PtsyvYL3KmA6C8f0ZpXQ=7FEqQtETVy-BOF+cm9WPvfMQ@mail.gmail.com
Backpatch-through: 15

Author: MasaoFujii

doc/src/sgml/ref/alter_publication.sgml

@@ -30,13 +30,17 @@ ALTER PUBLICATION <replaceable class="parameter">name</replaceable> RENAME TO <r
 
 <phrase>where <replaceable class="parameter">publication_object</replaceable> is one of:</phrase>
 
-    TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ] [, ... ]
+    TABLE <replaceable class="parameter">table_and_columns</replaceable> [, ... ]
     TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
 
-<phrase>where <replaceable class="parameter">publication_drop_object</replaceable> is one of:</phrase>
+<phrase>and <replaceable class="parameter">publication_drop_object</replaceable> is one of:</phrase>
 
     TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [, ... ]
     TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
+
+<phrase>and <replaceable class="parameter">table_and_columns</replaceable> is:</phrase>
+
+    [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ]
 </synopsis>
  </refsynopsisdiv>
 

doc/src/sgml/ref/create_publication.sgml

@@ -22,18 +22,22 @@ PostgreSQL documentation
  <refsynopsisdiv>
 <synopsis>
 CREATE PUBLICATION <replaceable class="parameter">name</replaceable>
-    [ FOR { <replaceable class="parameter">publication_object</replaceable> [, ... ] | <replaceable class="parameter">all_publication_object</replaceable> [, ... ] } ]
+    [ FOR { <replaceable class="parameter">publication_object</replaceable> [, ... ] | <replaceable class="parameter">publication_all_object</replaceable> [, ... ] } ]
     [ WITH ( <replaceable class="parameter">publication_parameter</replaceable> [= <replaceable class="parameter">value</replaceable>] [, ... ] ) ]
 
 <phrase>where <replaceable class="parameter">publication_object</replaceable> is one of:</phrase>
 
-    TABLE [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ] [, ... ]
+    TABLE <replaceable class="parameter">table_and_columns</replaceable> [, ... ]
     TABLES IN SCHEMA { <replaceable class="parameter">schema_name</replaceable> | CURRENT_SCHEMA } [, ... ]
 
-<phrase>where <replaceable class="parameter">all_publication_object</replaceable> is one of:</phrase>
+<phrase>and <replaceable class="parameter">publication_all_object</replaceable> is one of:</phrase>
 
     ALL TABLES
     ALL SEQUENCES
+
+<phrase>and <replaceable class="parameter">table_and_columns</replaceable> is:</phrase>
+
+    [ ONLY ] <replaceable class="parameter">table_name</replaceable> [ * ] [ ( <replaceable class="parameter">column_name</replaceable> [, ... ] ) ] [ WHERE ( <replaceable class="parameter">expression</replaceable> ) ]
 </synopsis>
  </refsynopsisdiv>