[gtk] docs: migration guide fixes

[Claudio Saavedra <csaavedra src gnome org>]

commit e818bf85145d036bd6143d42da6c4fb6934559d1
Author: Claudio Saavedra <csaavedra igalia com>
Date:   Tue Apr 21 15:37:45 2020 +0300

    docs: migration guide fixes

 docs/reference/gtk/migrating-3to4.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-3to4.xml b/docs/reference/gtk/migrating-3to4.xml
index 67290812e1..53c1b67ef1 100644
--- a/docs/reference/gtk/migrating-3to4.xml
+++ b/docs/reference/gtk/migrating-3to4.xml
@@ -428,8 +428,8 @@
       <para>
         If you need to do forward or backward mapping between key codes
         and key values, use gdk_display_map_keycode() and gdk_display_map_keyval(),
-        which is the replacement for gdk_keymap_get_entries_for_keycode()
-        and gdk_keymap_get_entries_for_keycode().
+        which are the replacements for gdk_keymap_get_entries_for_keycode()
+        and gdk_keymap_get_entries_for_keyval().
       </para>
     </section>