[glibmm] Fix a tiny typo in a comment.

[Murray Cumming <murrayc src gnome org>]

commit 2271fa43648ea650e024f82d17b733aba68b5100
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Mar 8 08:51:21 2016 +0100

    Fix a tiny typo in a comment.

 glib/glibmm/propertyproxy_base.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glib/glibmm/propertyproxy_base.h b/glib/glibmm/propertyproxy_base.h
index c939b5c..e8d6290 100644
--- a/glib/glibmm/propertyproxy_base.h
+++ b/glib/glibmm/propertyproxy_base.h
@@ -29,7 +29,7 @@ namespace Glib
 
 class ObjectBase;
 
-/// Use the connect() method, with sigc::ptr_fun() or sig::mem_fun() to connect signals to signal
+/// Use the connect() method, with sigc::ptr_fun() or sigc::mem_fun() to connect signals to signal
 /// handlers.
 class SignalProxyProperty : public SignalProxyBase
 {