message: fix typo; thanks Kerollmops!
diff: @@ -79,7 +79,7 @@ struct Run {
  )]
  backend: Backend,
  - /// Emscripten symbol ma>p
  + /// Emscripten symbol map
  #[structopt(long = "em-symbol-map", parse(from_os_str), group = "emscripten")]
  em_symbol_map: Option<PathBuf>,
  