release notes: split apart hash items

Report by Tom Lane, Robert Haas

Author: bmomjian

doc/src/sgml/release-9.5.sgml

@@ -221,8 +221,7 @@
 
       <listitem>
        <para>
-        Improve hash creation and lookup performance (Tomas Vondra,
-        Teodor Sigaev, Tom Lane, Robert Haas)
+        Improve in-memory hash performance (Tomas Vondra, Robert Haas)
        </para>
       </listitem>
 
@@ -1795,6 +1794,12 @@
        </para>
       </listitem>
 
+      <listitem>
+       <para>
+        Improve dynahash capabilities (Teodor Sigaev, Tom Lane)
+       </para>
+      </listitem>
+
       <listitem>
        <para>
         Improve parallel execution infrastructure (Robert Haas, Amit