[gtkmm] Slight rewrite of documentation

[Murray Cumming <murrayc src gnome org>]

commit f7d118d25f0fd81d4d9c272a5276c0646fd204e7
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon May 28 21:54:09 2012 +0200

    Slight rewrite of documentation

 gtk/src/widget.hg |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gtk/src/widget.hg b/gtk/src/widget.hg
index 34031f1..578c519 100644
--- a/gtk/src/widget.hg
+++ b/gtk/src/widget.hg
@@ -823,8 +823,11 @@ protected:
   _IGNORE(gtk_widget_get_child_requisition) //deprecated.
 
   //The parameter name is "the_property_name" to avoid a warning because there is a method with the "property_name" name.
-  /** Gets the value of a style property of @a widget. Most of the time, you want
-   * to use get_style_property().
+  /** Gets the value of a style property of @a widget.
+   * 
+   * It is usually easier to use get_style_property(), to avoid the use of 
+   * Glib::Value.
+   *
    * @param the_property_name The name of a style property.
    * @param value Location to return the property value.
    */