[gtk/matthiasc/for-main] docs: Clarify a sentence in the migration guide

[Matthias Clasen <matthiasc src gnome org>]

commit 5a42ccc57557d966d55dfadd7f0f624a901cd370
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Nov 30 19:51:22 2021 -0500

    docs: Clarify a sentence in the migration guide
    
    Make it clear that we are giving examples of
    no-longer existing APIs here.
    
    Fixes: #4479

 docs/reference/gtk/migrating-3to4.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/reference/gtk/migrating-3to4.md b/docs/reference/gtk/migrating-3to4.md
index fcb3af5d76..068b97212a 100644
--- a/docs/reference/gtk/migrating-3to4.md
+++ b/docs/reference/gtk/migrating-3to4.md
@@ -410,8 +410,8 @@ have been removed. Update your code accordingly.
 Any APIs that deal with global (or root) coordinates have been
 removed in GTK 4, since not all backends support them. You should
 replace your use of such APIs with surface-relative equivalents.
-Examples of this are `gdk_surface_get_origin()`, `gdk_surface_move()`
-or `gdk_event_get_root_coords()`.
+Examples of such removed APIs are `gdk_window_get_origin()`,
+`gdk_window_move()` or `gdk_event_get_root_coords()`.
 
 ### Adapt to `GdkKeymap` API changes