[gtkmm] Box: Correct method names in documentation.

[Murray Cumming <murrayc src gnome org>]

commit f9d87572555096e45d361d0719028ba2ca88dab2
Author: Murray Cumming <murrayc murrayc com>
Date:   Thu Apr 27 10:21:23 2017 +0200

    Box: Correct method names in documentation.

 gtk/src/box.hg |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtk/src/box.hg b/gtk/src/box.hg
index e64e488..4cc1674 100644
--- a/gtk/src/box.hg
+++ b/gtk/src/box.hg
@@ -62,9 +62,9 @@ enum PackOptions
  * occupy the same amount of space.
  *
  * Use set_spacing() to determine the minimum
- * space placed between all children in the Gtk::Box.  Note that
+ * space placed between all children in the Gtk::Box. Note that
  * spacing is added between the children, while
- * padding added by gtk_box_pack_start() or gtk_box_pack_end() is added
+ * padding added by pack_start() or pack_end() is added
  * on either side of the widget it belongs to.
  *
  * Use reorder_child() to