Add a comment to get_matches_from for --help

cmd/soroban-cli/src/commands/contract/arg_parsing.rs

@@ -63,15 +63,10 @@ pub fn build_host_function_parameters(
     cmd.build();
     let long_help = cmd.render_long_help();
 
-    match cmd.clone().try_get_matches_from(slop) {
-        Ok(m) => m,
-        Err(e) => {
-            println!("Failed to match subcommand: {}", e);
-            std::process::exit(1);
-        }
-    };
-
+    // get_matches_from exits if `help`, `--help` or `-h`are passed in the slop
+    // see clap documentation for more info: https://github.com/clap-rs/clap/blob/v4.1.8/src/builder/command.rs#L631
     let mut matches_ = cmd.get_matches_from(slop);
+
     let Some((function, matches_)) = &matches_.remove_subcommand() else {
         println!("{long_help}");
         std::process::exit(1);