[gtkmm] PrintOperation: run(): Add documentation.

[Murray Cumming <murrayc src gnome org>]

commit 6a8235e9df71b8a74d8b3e53403396ba0cef8826
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Oct 9 11:06:56 2013 +0200

    PrintOperation: run(): Add documentation.

 gtk/src/printoperation.hg |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/src/printoperation.hg b/gtk/src/printoperation.hg
index b9db086..288b60a 100644
--- a/gtk/src/printoperation.hg
+++ b/gtk/src/printoperation.hg
@@ -94,9 +94,10 @@ public:
 
   #m4 _CONVERSION(`GtkPrintOperationAction',`PrintOperationAction',`($2)$3')
 
+  /** See the run() method that takes both action and parent parameters.
+   */
   PrintOperationResult run(PrintOperationAction action = PRINT_OPERATION_ACTION_PRINT_DIALOG);
 
-  //TODO: parent can be null.
   _WRAP_METHOD(PrintOperationResult run(PrintOperationAction action, Window& parent), 
gtk_print_operation_run, errthrow)
 
   _WRAP_METHOD(PrintStatus get_status() const, gtk_print_operation_get_status)