2013-03-26: add final linebreak to example.w

add final linebreak to example.w

diff --git a/example.w b/example.w
--- a/example.w
+++ b/example.w
@@ -53,4 +53,4 @@ let
     : a b
       c
 
-let : : a b
\ No newline at end of file
+let : : a b