docs: fix example that as runtime panic. Relates to
Relevant comment:
@@ -278,7 +278,7 @@ pub trait FromArgMatches: Sized {
/// #[derive(clap::Args)]
/// struct LogArgs {
/// #[arg(long, short = 'v', action = clap::ArgAction::Count)]
-/// verbose: i8,
+/// verbose: u8,
/// }
/// ```
pub trait Args: FromArgMatches + Sized {
