9.6 release notes: correct summary item about freeze

bmomjian · bmomjian · commit c9cf432ef32a · 2016-09-07T20:51:31.000-04:00
Previously it less precisely talked about autovacuum.

Backpatch-through: 9.6
diff --git a/doc/src/sgml/release-9.6.sgml b/doc/src/sgml/release-9.6.sgml
@@ -29,7 +29,7 @@
 
     <listitem>
      <para>
-      Autovacuum no longer performs repetitive scanning of old data
+      Avoid scanning pages unnecessarily during vacuum freeze operations
      </para>
     </listitem>
 
