[gtk-web] Update the links in the getting started page

[Emmanuele Bassi <ebassi src gnome org>]

commit 052f963068190ec012db5ebb46d85da135e320b3
Author: Emmanuele Bassi <ebassi gmail com>
Date:   Thu Aug 19 17:33:30 2021 +0000

    Update the links in the getting started page
    
    Link to the correct API references.

 _docs/getting-started/index.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/_docs/getting-started/index.md b/_docs/getting-started/index.md
index 3fb9c6c..98f1715 100644
--- a/_docs/getting-started/index.md
+++ b/_docs/getting-started/index.md
@@ -28,8 +28,8 @@ window resize, and notifies the widgets in your application.
 Follow the ["Hello World"](https://www.gtk.org/docs/getting-started/hello-world/)
 to learn how to write your first GTK application.
 
-Use the [GTK API reference](https://developer.gnome.org/gtk3/stable) to
+Use the [GTK API reference](https://docs.gtk.org/gtk4/) to
 learn more about the functionality provided by GTK.
 
-[builder]: https://developer.gnome.org/gtk3/stable/GtkBuilder.html
+[builder]: https://docs.gtk.org/gtk4/class.Builder.html
 [glade]: https://glade.gnome.org