doc/examples/flatpak-autotools: remove references to sdk.gnome.org
Description
Update thhe flatpak-autotools example to use flathub instead of sdk.gnome.org (which no longer exists).
This merge request, when approved, will close: #690 (closed)
Update thhe flatpak-autotools example to use flathub instead of sdk.gnome.org (which no longer exists).
This merge request, when approved, will close: #690 (closed)