Introduce missing public docs linting
//! [MLS RFC]: https://datatracker.ietf.org/doc/draft-ietf-mls-protocol/
#![cfg_attr(docsrs, feature(doc_cfg))]
#![cfg_attr(not(test), forbid(unsafe_code))]
+#![cfg_attr(not(feature = "test-utils"), warn(missing_docs))]
// === Testing ===
