doc: update release note item about the v2 wire protocol

bmomjian · bmomjian · commit 444302ed5627 · 2021-06-08T16:47:14.000-04:00
Protocol v2 was last used in PG 7.3, not 7.2. Reported-by: Tatsuo Ishii Discussion: https://postgr.es/m/20210608.091329.906837606658882674.t-ishii@sraoss.co.jp
diff --git a/doc/src/sgml/release-14.sgml b/doc/src/sgml/release-14.sgml
@@ -213,7 +213,7 @@ Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
      </para>
 
      <para>
-      This was last used as the default in Postgres 7.2 (year 2002).
+      This was last used as the default in Postgres 7.3 (year 2002).
      </para>
     </listitem>
 
