[gtk+] TreeMenu: Remove accidentally duplicated doc lines

[Daniel Boles <dboles src gnome org>]

commit f63519dc014ba598fddc38c9f1acb1975acc36a2
Author: Daniel Boles <dboles src gnome org>
Date:   Wed Oct 4 12:02:55 2017 +0100

    TreeMenu: Remove accidentally duplicated doc lines
    
    Not that it actually matters, as this is not public anymore, but this
    was done accidentally. Also, sync a property description to ComboBox.

 gtk/gtkcombobox.c |    2 +-
 gtk/gtktreemenu.c |    3 ---
 2 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index 509b5c6..2245aac 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -687,7 +687,7 @@ gtk_combo_box_class_init (GtkComboBoxClass *klass)
    *
    * If this is set to a non-negative value, it must be the index of a column
    * of type %G_TYPE_INT in the model. The value in that column for each item
-   * will determine how many rows the item will span in the popup. Therefore,
+   * will determine how many rows that item will span in the popup. Therefore,
    * values in this column must be greater than zero.
    *
    * Since: 2.4
diff --git a/gtk/gtktreemenu.c b/gtk/gtktreemenu.c
index bc98a13..13b9fb4 100644
--- a/gtk/gtktreemenu.c
+++ b/gtk/gtktreemenu.c
@@ -337,9 +337,6 @@ _gtk_tree_menu_class_init (GtkTreeMenuClass *class)
    * GtkTreeMenu:column-span-column:
    *
    * If this is set to a non-negative value, it must be the index of a column
-   * of type %G_TYPE_INT in the model.
-   *
-   * If this is set to a non-negative value, it must be the index of a column
    * of type %G_TYPE_INT in the model. The value in that column for each item
    * will determine how many columns that item will span in the popup.
    * Therefore, values in this column must be greater than zero, and the sum of