Address reviewer comments

components/support/nimbus-cli/src/output/fml_cli.rs

@@ -13,18 +13,22 @@ use nimbus_fml::command_line::do_main;
 
 pub(crate) fn fml_cli(args: &Vec<OsString>, cwd: &Path) -> Result<bool> {
     // We prepend the string `nimbus-cli fml` to the args to pass to FML
-    // because the clap uses the 0th argument for help messages.
+    // because the clap uses the 0th argument for help messages; so the FML's command line processor
+    // will report an error with a usage message of `nimbus-cli fml generate [FLAGS] INPUT OUTPUT`.
     let first = OsStr::new("nimbus-cli fml").to_os_string();
     let mut cli_args = vec![&first];
 
-    // To make this a little more ergonomic, if the user has just typed
-    // `nimbus-cli fml`, then we can help them a little bit.
     let help = OsStr::new("--help").to_os_string();
     if args.is_empty() {
+        // If the user has just typed `nimbus-cli fml`– with no furher arguments— then the rather unhelpful message
+        // `not implemented: Command  not implemented` is displayed. This will change if and when we upgrade the nimbus-fml
+        // to use cli-derive, but until then, we can do a simple thing to make the experience a bit nicer, by adding
+        // the `--help` flag, so the user gets the nimbus-fml command line help.
         cli_args.push(&help);
-    } else {
-        cli_args.extend(args);
     }
+
+    // Finally, send all the args after `nimbus-cli fml` verbatim to the FML clap cli.
+    cli_args.extend(args);
     do_main(cli_args, cwd)?;
     Ok(true)
 }