Remove server and libpq support for the version 2 wire protocol

In release-14.sgml:

<!--
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
2021-03-04 [3174d69fb] Remove server and libpq support for old FE/BE protocol v
-->

     <para>
      Remove server and <link linkend="libpq">libpq</link> support
      for the version 2 <link linkend="protocol">wire protocol</link>
      (Heikki Linnakangas)
     </para>

     <para>
      This was last used as the default in Postgres 7.2 (year 2002).
     </para>
    </listitem>

I thought the last version which used the protocol as the default was
7.3, not 7.2? Because v3 was introduced in 7.4.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp