[gtkmm] Remove a now-irrelevant comment.

[Murray Cumming <murrayc src gnome org>]

commit 79c7a40d375f49097f1a32a016942738bc8e51d2
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Sep 10 11:28:01 2013 +0200

    Remove a now-irrelevant comment.

 gtk/src/scale.hg |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/src/scale.hg b/gtk/src/scale.hg
index 3933c51..7b6fd3c 100644
--- a/gtk/src/scale.hg
+++ b/gtk/src/scale.hg
@@ -46,7 +46,6 @@ public:
 
   _CTOR_DEFAULT()
 
-  //Note that we try to use the same default parameter value as the default property value.
   /**
    * @newin{3,2}
    */