[gtk: 1/2] readme: Fix "Building GTK" docs link

[Emmanuele Bassi <ebassi src gnome org>]

commit 75bba2b055da2d868e4d34022b4b82b2684e93e5
Author: enterprisey <59171-enterprisey users noreply gitlab gnome org>
Date:   Mon Oct 25 07:59:03 2021 +0000

    readme: Fix "Building GTK" docs link

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 8d65caf1c9..5c4b46cf94 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ can be found in the file:
 docs/reference/gtk/html/gtk-building.html
 ```
 
-Or [online](https://developer.gnome.org/gtk4/stable/gtk-building.html)
+Or [online](https://docs.gtk.org/gtk4/building.html)
 
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