release notes: Add entry for commit 5ea86e6.

Peter Geoghegan and Robert Haas

Author: robertmhaas

doc/src/sgml/release-9.5.sgml

@@ -219,6 +219,15 @@
        </para>
       </listitem>
 
+      <listitem>
+       <para>
+        Extend the infrastructure allow sorting to be performed by inlined,
+        non-<acronym>SQL</acronym>-callable comparison functions to cover
+        <command>CREATE INDEX</>, <command>REINDEX</>, and
+        <command>CLUSTER</> (Peter Geoghegan)
+       </para>
+      </listitem>
+
       <listitem>
        <para>
         Improve in-memory hash performance (Tomas Vondra, Robert Haas)