[gtk/docs-typos] docs: Fix up some typos

[Matthias Clasen <matthiasc src gnome org>]

commit 18af0f2a32c35239a4fdb227cd830721846290c0
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Nov 10 12:38:17 2021 -0500

    docs: Fix up some typos

 docs/reference/gtk/migrating-3to4.md | 2 +-
 docs/reference/gtk/question_index.md | 2 +-
 gdk/gdksurface.c                     | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-3to4.md b/docs/reference/gtk/migrating-3to4.md
index 492e8628e4..cdf2f1d9b2 100644
--- a/docs/reference/gtk/migrating-3to4.md
+++ b/docs/reference/gtk/migrating-3to4.md
@@ -333,7 +333,7 @@ had replacements in GTK 3 and were deprecated in favor of `GdkSeat`.
 
 In GTK 4, the two roles of a standalone toplevel window and of a popup that
 is placed relative to a parent window have been separated out into two
-interfaces, [class@Gdk.Toplevel] and [class@Gdk.Popup]. Surfaces
+interfaces, [iface@Gdk.Toplevel] and [iface@Gdk.Popup]. Surfaces
 implementing these interfaces are created with [ctor@Gdk.Surface.new_toplevel]
 and [ctor@Gdk.Surface.new_popup], respectively, and they are presented on
 screen using [method@Gdk.Toplevel.present] and [method@Gdk.Popup.present].
diff --git a/docs/reference/gtk/question_index.md b/docs/reference/gtk/question_index.md
index 656f245ced..95119a69a0 100644
--- a/docs/reference/gtk/question_index.md
+++ b/docs/reference/gtk/question_index.md
@@ -432,7 +432,7 @@ the question you have, this list is a good place to start.
 
 26. How do I associate some data with a row in the tree?
 
-    Remember that the [class@Gtk.TreeModel] columns don't necessarily have to be
+    Remember that the [iface@Gtk.TreeModel] columns don't necessarily have to be
     displayed. So you can put non-user-visible data in your model just
     like any other data, and retrieve it with [method Gtk TreeModel get].
     See the [tree widget overview](#TreeWidget).        
diff --git a/gdk/gdksurface.c b/gdk/gdksurface.c
index 3f2b5189ff..ece5f7bd66 100644
--- a/gdk/gdksurface.c
+++ b/gdk/gdksurface.c
@@ -59,8 +59,8 @@
  * It’s a low-level object, used to implement high-level objects
  * such as [class@Gtk.Window] or [class@Gtk.Dialog] in GTK.
  *
- * The surfaces you see in practice are either [class@Gdk.Toplevel] or
- * [class@Gdk.Popup], and those interfaces provide much of the required
+ * The surfaces you see in practice are either [iface@Gdk.Toplevel] or
+ * [iface@Gdk.Popup], and those interfaces provide much of the required
  * API to interact with these surfaces. Other, more specialized surface
  * types exist, but you will rarely interact with them directly.
  */