message: Fix cache_messages::rustdoc test broken on beta.
diff: @@ -238,12 +238,8 @@ fn rustdoc() {
  .file(
  "src/lib.rs",
  "
  - #![warn(private_doc_tests)]
  - /// asdf
  - /// ```
  - /// let x = 1;
  - /// ```
  - fn f() {}
  + #![warn(missing_docs)]
  + pub fn f() {}
  ",
  )
  .build();
  @@ -254,7 +250,7 @@ fn rustdoc() {
  .expect("rustdoc to run");
  assert!(rustdoc_output.status.success());
  let rustdoc_stderr = as_str(&rustdoc_output.stderr);
  - assert!(rustdoc_stderr.contains("private"));
  + assert!(rustdoc_stderr.contains("missing"));
  assert!(rustdoc_stderr.contains("\x1b["));
  assert_eq!(
  p.glob("target/debug/.fingerprint/foo-*/output-*").count(),
  