All links on the "feedback" page are broken due to incorrect URLs
Over at https://developer.gnome.org/hig/patterns/feedback.html
, if you click, for example, "Notifications," it'll 404, because the URL has mistakenly been set to https://developer.gnome.org/hig/patterns/controls/notifications.html
instead of https://developer.gnome.org/hig/patterns/feedback/notifications.html
. This is the same for all buttons on the page. The correct pages can still be accessed from the sidebar, however.