Update docs

docs/game_id.json.md

@@ -37,7 +37,7 @@ The executable to run when launching a game.
 
 If the source has a URL handler, using that is preferred. In that case, the value should be `["xdg-open", "url://example/url"]` for Linux and `["start", "url://example/url"]` for Windows.
 
-Stored as an argument vector to be passed to the shell through [GLib.spawn_async](https://docs.gtk.org/glib/func.spawn_async.html).
+Stored as either a string or an argument vector to be passed to the shell through [subprocess.Popen](https://docs.python.org/3/library/subprocess.html#popen-constructor).
 
 ### game_id