[gtk+] combobox: Fix documentation typo bx => box

[Daniel Boles <dboles src gnome org>]

commit c662e691ed1e751abe5b30d548599950123344a7
Author: Daniel Boles <dboles src gnome org>
Date:   Sat Jan 21 16:10:32 2017 +0000

    combobox: Fix documentation typo bx => box

 gtk/gtkcombobox.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkcombobox.c b/gtk/gtkcombobox.c
index 7581fea..f54a09f 100644
--- a/gtk/gtkcombobox.c
+++ b/gtk/gtkcombobox.c
@@ -111,7 +111,7 @@
  * ]|
  *
  * A GtkComboBox with an entry has a single CSS node with name combobox. It
- * contains a bx with the .linked class and that box contains an entry and a
+ * contains a box with the .linked class. That box contains an entry and a
  * button, both with the .combo class added.
  * The button also contains another node with name arrow.
  */