example(magic): make arguments to connect named

## Description

I don't think it can be used without this

## Notes & open questions

Related to connectivity testing

## Change checklist

- [ ] Self-review.
- [ ] Documentation updates if relevant.
- [ ] Tests if relevant.

Author: rklaehn

iroh-net/examples/magic.rs

@@ -32,7 +32,9 @@ enum Command {
     Listen,
     Connect {
         peer_id: String,
+        #[clap(long)]
         addrs: Option<Vec<SocketAddr>>,
+        #[clap(long)]
         derp_region: Option<u16>,
     },
 }