[gtk+] scrolledwindow: update GtkPolicyType docs

[Stefan Kost <stefkost src gnome org>]

commit 406974fdb16abefe6f25f390a7b80fcfbc43c928
Author: Stefan Sauer <ensonic users sf net>
Date:   Fri Jun 13 19:04:39 2014 +0200

    scrolledwindow: update GtkPolicyType docs
    
    The policy is not determining the visibility of the scrollbars anymore, but the
    how the size is to be computed to achive the selected visibility.

 gtk/gtkscrolledwindow.h |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.h b/gtk/gtkscrolledwindow.h
index 9ac60f8..d666f3a 100644
--- a/gtk/gtkscrolledwindow.h
+++ b/gtk/gtkscrolledwindow.h
@@ -120,12 +120,15 @@ typedef enum
 
 /**
  * GtkPolicyType:
- * @GTK_POLICY_ALWAYS: The scrollbar is always visible.
- * @GTK_POLICY_AUTOMATIC: The scrollbar will appear and disappear as necessary. For example,
- *  when all of a #GtkTreeView can not be seen.
- * @GTK_POLICY_NEVER: The scrollbar will never appear.
+ * @GTK_POLICY_ALWAYS: The scrollbar is always visible. The view size is
+ *  independent of the content.
+ * @GTK_POLICY_AUTOMATIC: The scrollbar will appear and disappear as necessary.
+ *  For example, when all of a #GtkTreeView can not be seen.
+ * @GTK_POLICY_NEVER: The scrollbar should never appear. In this mode the
+ *  content determines the size.
  *
- * Determines when a scroll bar will be visible.
+ * Determines how the size should be computed to achieve the one of the
+ * visibility mode for the scrollbars.
  */
 typedef enum
 {