PG 10 release notes: change trigger transition tables

Add attribution of trigger transition tables for Thomas Munro.

Reported-by: Thomas Munro

Discussion: https://postgr.es/m/CAEepm=2bDFgr4ut+1-QjKQY4MA=5ek8Ap3nyB19y2tpTL6xxtA@mail.gmail.com

Backpatch-through: 10

doc/src/sgml/release-10.sgml

@@ -1594,7 +1594,8 @@
 -->
       <para>
        Add <link linkend="SQL-CREATETRIGGER"><literal>AFTER</> trigger</>
-       transition tables to record changed rows (Kevin Grittner)
+       transition tables to record changed rows (Kevin Grittner, Thomas
+       Munro)
       </para>
 
       <para>