Fix PG 14 relnotes to use <link> instead of <xref>. This was discussed
in commit message
59fa7eb603.
<!-- doc/src/sgml/libpq.sgml -->
-<chapter id="libpq" xreflabel="libpq">
+<chapter id="libpq">
<title><application>libpq</application> — C Library</title>
<indexterm zone="libpq">
-->
<para>
-Remove server and <xref linkend="libpq"/> support for the version 2 <link linkend="protocol">wire protocol</link> (Heikki Linnakangas)
+Remove server and <link linkend="libpq">libpq</link> support for the version 2 <link linkend="protocol">wire protocol</link> (Heikki Linnakangas)
</para>
<para>