Recommend more clearly custom pg_dump format over tar, buy showing

custom format examples first.

doc/src/sgml/ref/pg_dump.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.83 2006/04/15 18:11:16 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.84 2006/05/06 23:25:37 momjian Exp $
 PostgreSQL documentation
 -->
 
@@ -244,28 +244,28 @@ PostgreSQL documentation
         </varlistentry>
 
         <varlistentry>
-         <term><literal>t</></term>
-         <term><literal>tar</></term>
+         <term><literal>c</></term>
+         <term><literal>custom</></term>
          <listitem>
           <para>
-         Output a <command>tar</command> archive suitable for input into 
-         <application>pg_restore</application>. Using this archive format 
-         allows reordering and/or exclusion of database objects
-         at the time the database is restored. It is also possible to limit 
-         which data is reloaded at restore time.
+         Output a custom archive suitable for input into 
+         <application>pg_restore</application>. This is the most flexible 
+         format in that it allows reordering of loading data as well 
+         as object definitions. This format is also compressed by default.
           </para>
          </listitem>
         </varlistentry>
 
         <varlistentry>
-         <term><literal>c</></term>
-         <term><literal>custom</></term>
+         <term><literal>t</></term>
+         <term><literal>tar</></term>
          <listitem>
           <para>
-         Output a custom archive suitable for input into 
-         <application>pg_restore</application>. This is the most flexible 
-         format in that it allows reordering of loading data as well 
-         as object definitions. This format is also compressed by default.
+         Output a <command>tar</command> archive suitable for input into 
+         <application>pg_restore</application>. Using this archive format 
+         allows reordering and/or exclusion of database objects
+         at the time the database is restored. It is also possible to limit 
+         which data is reloaded at restore time.
           </para>
          </listitem>
         </varlistentry>
@@ -665,11 +665,11 @@ CREATE DATABASE foo WITH TEMPLATE template0;
   </para>
 
   <para>
-   To dump a database called <literal>mydb</> to a <filename>tar</filename>
+   To dump a database called <literal>mydb</> to a file in custom format:
    file:
 
 <screen>
-<prompt>$</prompt> <userinput>pg_dump -Ft mydb &gt; db.tar</userinput>
+<prompt>$</prompt> <userinput>pg_dump -Fc mydb &gt; db.out</userinput>
 </screen>
   </para>
 
@@ -677,7 +677,7 @@ CREATE DATABASE foo WITH TEMPLATE template0;
    To reload this dump into an existing database called <literal>newdb</>:
 
 <screen>
-<prompt>$</prompt> <userinput>pg_restore -d newdb db.tar</userinput>
+<prompt>$</prompt> <userinput>pg_restore -d newdb db.out</userinput>
 </screen>
   </para>