Remove documentation mention of pglesslog, which was added in 2009

because there was only a beta for 9.0 and it does not compile on 9.1.

doc/src/sgml/backup.sgml

@@ -1246,22 +1246,6 @@ tar -rf /var/lib/pgsql/backup.tar /var/lib/pgsql/archive/
       Please remember to add error handling to your backup scripts.
      </para>
 
-     <para>
-      If archive storage size is a concern, use <application>pg_compresslog</>,
-      <ulink url="http://pglesslog.projects.postgresql.org"></ulink>, to
-      remove unnecessary <xref linkend="guc-full-page-writes"> and trailing
-      space from the WAL files.  You can then use
-      <application>gzip</application> to further compress the output of
-      <application>pg_compresslog</>:
-<programlisting>
-archive_command = 'pg_compresslog %p - | gzip &gt; /var/lib/pgsql/archive/%f'
-</programlisting>
-      You will then need to use <application>gunzip</> and
-      <application>pg_decompresslog</> during recovery:
-<programlisting>
-restore_command = 'gunzip &lt; /mnt/server/archivedir/%f | pg_decompresslog - %p'
-</programlisting>
-     </para>
     </sect3>
 
     <sect3 id="backup-scripts">