release notes: add Petr Jelinek to JSON function item

Report by Petr Jelinek

Author: bmomjian

doc/src/sgml/release-9.5.sgml

@@ -1064,7 +1064,7 @@
         linkend="functions-json-processing-table"><function>jsonb_set()</></>
         and <link
         linkend="functions-json-processing-table"><function>jsonb_pretty</></>
-        (Dmitry Dolgov, Andrew Dunstan)
+        (Dmitry Dolgov, Andrew Dunstan, Petr Jelinek)
        </para>
       </listitem>