doc: remove duplicate PG 10 release notes entry

Reported-by: Daniel Gustafsson

doc/src/sgml/release-10.sgml

@@ -137,17 +137,6 @@
      </para>
     </listitem>
 
-    <listitem>
-     <!--
-     Author: Peter Eisentraut <peter_e@gmx.net> 2017-05-12 [c1a7f64b4]
-     Replace "transaction log" with "write-ahead log"
-     -->
-     <para>
-      Rename<acronym>WAL</>-related functions and views to use <literal>lsn</>
-      instead of <literal>location</> (David Rowley)
-     </para>
-    </listitem>
-
     <listitem>
      <!--
      Author: Andres Freund <andres@anarazel.de>