[gtk+] docs: add docs for GtkTargetPair

[William Jon McCann <mccann src gnome org>]

commit 29f2578cca2d929280c112ddd90a754930ec9729
Author: William Jon McCann <william jon mccann gmail com>
Date:   Mon Jan 20 15:18:21 2014 -0500

    docs: add docs for GtkTargetPair

 gtk/gtkselection.h        |   26 +++++++++++++++++++++++---
 gtk/gtkselectionprivate.h |   11 ++---------
 2 files changed, 25 insertions(+), 12 deletions(-)
---
diff --git a/gtk/gtkselection.h b/gtk/gtkselection.h
index 2bc5fe0..af474f3 100644
--- a/gtk/gtkselection.h
+++ b/gtk/gtkselection.h
@@ -34,13 +34,33 @@
 
 G_BEGIN_DECLS
 
+typedef struct _GtkTargetPair GtkTargetPair;
+
+/**
+ * GtkTargetPair:
+ * @target: #GdkAtom representation of the target type
+ * @flags: #GtkTargetFlags for DND
+ * @info: an application-assigned integer ID which will
+ *     get passed as a parameter to e.g the #GtkWidget::selection-get
+ *     signal. It allows the application to identify the target
+ *     type without extensive string compares.
+ *
+ * A #GtkTargetPair structure is used to represent the same
+ * information as a table of #GtkTargetEntry, but in
+ * an efficient form.
+ */
+struct _GtkTargetPair
+{
+  GdkAtom   target;
+  guint     flags;
+  guint     info;
+};
+
 /**
  * GtkTargetList:
  *
  * A #GtkTargetList structure is a reference counted list
- * of #GtkTargetPair. It is used to represent the same
- * information as a table of #GtkTargetEntry, but in
- * an efficient form. This structure should be treated as
+ * of #GtkTargetPair. This structure should be treated as
  * opaque.
  */
 typedef struct _GtkTargetList  GtkTargetList;
diff --git a/gtk/gtkselectionprivate.h b/gtk/gtkselectionprivate.h
index 0b965f5..8d557e8 100644
--- a/gtk/gtkselectionprivate.h
+++ b/gtk/gtkselectionprivate.h
@@ -37,6 +37,7 @@ G_BEGIN_DECLS
 
 struct _GtkSelectionData
 {
+  /*< private >*/
   GdkAtom       selection;
   GdkAtom       target;
   GdkAtom       type;
@@ -48,19 +49,11 @@ struct _GtkSelectionData
 
 struct _GtkTargetList
 {
+  /*< private >*/
   GList *list;
   guint ref_count;
  };
 
-typedef struct _GtkTargetPair GtkTargetPair;
-struct _GtkTargetPair
-{
-  GdkAtom   target;
-  guint     flags;
-  guint     info;
-};
-
-
 gboolean _gtk_selection_clear           (GtkWidget         *widget,
                                          GdkEventSelection *event);
 gboolean _gtk_selection_request         (GtkWidget         *widget,