Possible values listed for flags (and shouldn't be); cargo test fails for the same reason

[ilyagr]

When there is a flag defined with something like:

        /// lists test values
        #[arg(short, long)]
        list: bool,

clap-markdown currently adds "Possible values: true, false" to its help. This is undersired, since the user cannot do --list false.

This example is taken from the tests for this library. Currently, this results in the test failure because the (buggy) output is not shown in https://github.com/ConnorGray/clap-markdown/blob/16c42cdd5f65b815bc1672e0b0e2becf08a5f8f1/docs/examples/complex-app.md.

The correct output would be the one actually shown in the above link:

###### **Options:**

 * `-l`, `--list` — lists test values

Instead, clap-markdown currently prints:

 * `-l`, `--list` — lists test values

  Possible values: `true`, `false`

---

I'm using clap 4.4.18. In case the version matters, here's my full Cargo.lock that cargo test generated for this repo:

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