message: subscriber: fix wrong `doc_cfg` attribute
  This `doc_cfg` attribute's `cfg` part has multiple predicates without an
  `all`, which iis what's breaking the netlify build. I'm...kind of
  surprised this ever succeeded, since the cfg is malformed...
diff: @@ -12,7 +12,7 @@ mod time_crate;
  pub use time_crate::UtcTime;
  #[cfg(feature = "local-time")]
  -#[cfg_attr(docsrs, doc(cfg(unsound_local_offset, feature = "local-time")))]
  +#[cfg_attr(docsrs, doc(cfg(all(unsound_local_offset, feature = "local-time"))))]
  pub use time_crate::LocalTime;
  /// A type that can measure and format the current time.
  