Cosmetic fixes for pg_createsubscriber's -all option.

Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://postgr.es/m/CAHut+PsmSCQ-ENSDQ0YOUcsgzT=GG-E9jyXBvxd51A_dMXH5XA@mail.gmail.com

doc/src/sgml/ref/pg_createsubscriber.sgml

@@ -94,8 +94,11 @@ PostgreSQL documentation
       <para>
        Create one subscription per database on the target server. Exceptions
        are template databases and databases that don't allow connections.
-       If the database name is not specified in publisher-server, the postgres
-       database will be used, or if that does not exist, template1 will be used.
+       To discover the list of all databases, connect to the source server
+       using the database name specified in the <option>--publisher-server</option>
+       connection string, or if not specified, the <literal>postgres</literal>
+       database will be used, or if that does not exist, <literal>template1</literal>
+       will be used.
        Automatically generated names for subscriptions, publications, and
        replication slots are used when this option is specified.
        This option cannot be used along with <option>--database</option>,

src/bin/pg_basebackup/pg_createsubscriber.c

@@ -1963,8 +1963,8 @@ enable_subscription(PGconn *conn, const struct LogicalRepInfo *dbinfo)
 }
 
 /*
- * Fetch a list of all not-template databases from the source server and form
- * a list such that they appear as if the user has specified multiple
+ * Fetch a list of all connectable non-template databases from the source server
+ * and form a list such that they appear as if the user has specified multiple
  * --database options, one for each source database.
  */
 static void