[gtk+] Adjusted new documentation for GtkSizeGroup.

[Tristan Van Berkom <tvb src gnome org>]

commit 2ee532645f38efa271daf4e6df9e33a98e710790
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Wed Sep 15 04:51:36 2010 +0900

    Adjusted new documentation for GtkSizeGroup.

 docs/reference/gtk/tmpl/gtksizegroup.sgml |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gtk/tmpl/gtksizegroup.sgml b/docs/reference/gtk/tmpl/gtksizegroup.sgml
index 4d6329f..35b57b9 100644
--- a/docs/reference/gtk/tmpl/gtksizegroup.sgml
+++ b/docs/reference/gtk/tmpl/gtksizegroup.sgml
@@ -51,7 +51,13 @@ will be allocated in one dimension, it cannot derive how much height
 a widget will receive for a given width). When grouping widgets that
 trade height for width in mode %GTK_SIZE_GROUP_VERTICAL or %GTK_SIZE_GROUP_BOTH: 
 the height for the minimum width will be the requested height for all 
-widgets in the group.
+widgets in the group. The same is of course true when horizontally grouping
+width for height widgets.
+</para>
+<para>
+Widgets that trade height-for-width should set a reasonably large minimum width
+by way of GtkLabel:width-chars for instance. Widgets with static sizes as well 
+as widgets that grow (such as ellipsizing text) need no such considerations.
 </para>
 <refsect2 id="GtkSizeGroup-BUILDER-UI">
 <title>GtkSizeGroup as GtkBuildable</title>