And add `#![deny(missing_docs)]` to the top of the files to enforce it. Attempted in [af182d4ab51d6a1a70559bbdcd4ab842aa855684](https://gitweb.torproject.org/tor.git/commit/?id=af182d4ab51d6a1a70559bbdcd4ab842aa855684) and [b6059297d7cb76f0e00e2098e38d6677d3033340](https://gitweb.torproject.org/tor.git/commit/?id=b6059297d7cb76f0e00e2098e38d6677d3033340) but forgot the exclamation point.