Mention the change in the output of --progress.

NEWS

@@ -71,6 +71,11 @@ Changes since 2.6.6:
     - If --delete is combined with --dirs without --recursive, rsync will
       now delete in any directory whose content is being synchronized.
 
+    - The file-count stats that are output by --progress were improved to
+      better indicate what the numbers mean.  For instance, the output:
+      "(xfer#5, to-check=8383/9999)" indicates that this was transferred
+      file #5, and we still need to check 8383 files out of 9999 total.
+
     - Some minor documentation improvements.
 
     - Updated some diffs in the patches dir.