Document long names for format options (plain, tar, custom). They already

worked and someone asked about them, so we might as well document them.

doc/src/sgml/ref/pg_dump.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.81 2005/11/01 21:09:50 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/pg_dump.sgml,v 1.82 2006/03/17 16:02:47 petere Exp $
 PostgreSQL documentation
 -->
 
@@ -229,6 +229,7 @@ PostgreSQL documentation
        <variablelist>
         <varlistentry>
          <term><literal>p</></term>
+         <term><literal>plain</></term>
          <listitem>
           <para>
            Output a plain-text <acronym>SQL</acronym> script file (default)
@@ -238,6 +239,7 @@ PostgreSQL documentation
 
         <varlistentry>
          <term><literal>t</></term>
+         <term><literal>tar</></term>
          <listitem>
           <para>
          Output a <command>tar</command> archive suitable for input into 
@@ -251,6 +253,7 @@ PostgreSQL documentation
 
         <varlistentry>
          <term><literal>c</></term>
+         <term><literal>custom</></term>
          <listitem>
           <para>
          Output a custom archive suitable for input into 

doc/src/sgml/ref/pg_restore.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/pg_restore.sgml,v 1.58 2006/02/13 21:29:08 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/pg_restore.sgml,v 1.59 2006/03/17 16:02:47 petere Exp $ -->
 
 <refentry id="APP-PGRESTORE">
  <refmeta>
@@ -165,6 +165,7 @@
        <variablelist>
         <varlistentry>
          <term><literal>t</></term>
+         <term><literal>tar</></term>
          <listitem>
           <para>
            The archive is a <command>tar</command> archive. Using this
@@ -177,6 +178,7 @@
 
         <varlistentry>
          <term><literal>c</></term>
+         <term><literal>custom</></term>
          <listitem>
           <para>
            The archive is in the custom format of