Fix link in popover.txt

AlexanderStein · sebp · commit 53c7b4f12137 · 2022-03-05T13:50:18.000Z
Fix link to documentation
diff --git a/source/popover.txt b/source/popover.txt
@@ -44,4 +44,4 @@ Example
 See Also
 --------
 
-- https://developer.gnome.org/hig/stable/popovers.html.en
+- https://developer.gnome.org/hig/patterns/containers/popovers.html
