[gtk+] docs: use function instead of removed macro

[William Jon McCann <mccann src gnome org>]

commit 29230c3fb9e2ce8ff028a69fc33f1dae8543d285
Author: William Jon McCann <william jon mccann gmail com>
Date:   Tue Jan 21 17:47:24 2014 -0500

    docs: use function instead of removed macro

 docs/reference/gtk/migrating-2to3.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-2to3.xml b/docs/reference/gtk/migrating-2to3.xml
index 0b027d5..7de372a 100644
--- a/docs/reference/gtk/migrating-2to3.xml
+++ b/docs/reference/gtk/migrating-2to3.xml
@@ -1001,7 +1001,7 @@ AM_CONDITIONAL(BUILD_x11, [test "x$have_x11" = "xyes"])
       The widget is expected to draw itself with its allocated size, which
       is available via the new gtk_widget_get_allocated_width() and
       gtk_widget_get_allocated_height() functions. It is not necessary to
-      check for GTK_WIDGET_IS_DRAWABLE(), since GTK+ already does this check
+      check for gtk_widget_is_drawable(), since GTK+ already does this check
       before emitting the #GtkWidget::draw signal.
     </para>
     <para>