Tweaks to NEWS

Author: hadley

NEWS

@@ -19,9 +19,9 @@ NEW FEATURES
 * New fortify methods have been added for objects produced by the `multcomp`
   package.
 
-* `stat_summary2d` / `stat_summary_hex`. These are arbitrary function version
-  of stat_bin2d / stat_binhex. Any summarization (as stat-summary for 1D) can
-  be done for 2D.
+* `stat_summary2d` and `stat_summary_hex`. These are work like `stat_bin2d`
+  and stat_binhex but allow any summarisation function (instead of just
+  count). They are 2d analogs of `stat_summary`
 
 DEVELOPMENT