nixos/invidious-router: fix documentation link formatting

Changed files
+1 -1
nixos
modules
services
+1 -1
nixos/modules/services/misc/invidious-router.nix
···
};
description = ''
Configuration for invidious-router.
-
Check https://gitlab.com/gaincoder/invidious-router#configuration
+
Check <https://gitlab.com/gaincoder/invidious-router#configuration>
for configuration options.
'';
};