Completion generation doesn't work and has a dead link for reference

[Solipsistmonkey]

Describe the bug
Following these instructions I ran into an error (first screenshot below). I half expected it to not work since I use Fish and only bash and zsh are listed in the documentation. Tested with zsh and bash as well and found that it wasn't a fish specific issue (second screenshot)

To Reproduce
See Above

Expected behavior
With the wording of the command, scout install-completion-script, I expect that the cli would detect which shell I'm using and, in my case, create the file $HOME/.config/fish/completions/scout.fish with the completions in there. Or, if I was using bash/zsh, append the appropriate completions to $HOME/.bashrc or $HOME/.zshrc.

Current behavior
Like the screenshots below, the cli errored out and gave a bad url.

Screenshots

Additional context
When I went to apple/swift-argument-parser repo I found this and tried out scout --generate-completion-script fish and it worked! Also tested for bash and zsh which also work fine (for generation, not installation).

So I went ahead and ran scout --generate-completion-script fish > $fish_complete_path[1]/scout.fish and it worked brilliantly.

And apparently bash, fish and zsh are the extent of the generate-completion system. I don't use xonsh, but figured I'd try it.

[Solipsistmonkey]

I don't know Swift at all. But it seems like doing some sort of check for which shell should be easy enough (I also know that when I say something should be easy, it has a 70% chance of being anything but). And then just appropriate logic.

Maybe using $XDG_CONFIG_HOME/scout/completions with the extensions .bash, .fish and .zsh for the respective files. Then with bash/zsh you could append a source $XDG_CONFIG_HOME/scout/completions.bash or source $XDG_CONFIG_HOME/scout/completions.zsh in the appropriate $HOME/.(bash|zsh)rc file. Or however completions work with those. I'm not super familiar. And with fish it'd be a simple echo "source $XDG_CONFIG_HOME/scout/completions.fish" > $fish_complete_path[1]/scout.fish (Or replace $XDG_CONFIG_HOME with a more suitable path).

Also, not entirely sure $fish_complete_path[1] is going to be universally the main directory for user generated/installed completions, but on the handful of systems I've used fish on, it has been. That might need some research