Address comments

Author: danimhr

src/main.rs

@@ -506,6 +506,8 @@ mod tests {
 
     #[test]
     fn test_parse_and_verify_proto_guardian_key() {
+        // The content below is generated by keygen script at:
+        // https://github.com/wormhole-foundation/wormhole/blob/main/node/cmd/guardiand/keygen.go
         let content = "-----BEGIN WORMHOLE GUARDIAN PRIVATE KEY-----
             PublicKey: 0x30e41be3f10d3ac813f91e49e189bbb948d030be