message: Use a stable rustdoc option for testing
diff: @@ -45,10 +45,8 @@ fn rustdoc_binary_args_passed() {
  p.cargo("rustdoc -v")
  .arg("--")
  - .arg("--theme")
  - .arg("dark")
  - .with_stderr_contains("[RUNNING] `rustdoc [..] --theme dark[..]`")
  - .with_status(101)
  + .arg("--markdown-no-toc")
  + .with_stderr_contains("[RUNNING] `rustdoc [..] --markdown-no-toc[..]`")
  .run();
  }
  