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Rust Version

rustc 1.66.0 (69f9c33d7 2022-12-12)

Clap Version

v4.2.2

Minimal reproducible code

fn main() {
        let app = Command::new("issue-4847")
        .arg(
            Arg::new("example")
                .long("example")
                .num_args(1..=2)
                .value_names(&["FOO", "BAR"])
        );
}

Steps to reproduce the bug with the above code

cargo run -- --help

Actual Behaviour

The output of --help is:

Usage: issue-4847 [OPTIONS]

Options:
      --example <FOO> <BAR>  
  -h, --help                 Print help

As a side-note, there are trailing spaces in the help output.

Expected Behaviour

The output of --help should indicate that the second parameter is optional, i.e.:

Usage: issue-4847 [OPTIONS]

Options:
      --example <FOO> [<BAR>]
  -h, --help                 Print help

Additional Context

No response

Debug Output

No response