message: appender: Fix typo in RollingFileAppender docs
  The `MakeWriter` trait comes from the `tracing-subscriber` crate,
  not `tracing-appender`.
diff: @@ -46,7 +46,7 @@ pub use builder::{Builder, InitError};
  /// writes without blocking the current thread.
  ///
  /// Additionally, `RollingFileAppender` also implements the [`MakeWriter`]
  -/// trait from `tracing-appender`, so it may also be used
  +/// trait from `tracing-subscriber`, so it may also be used
  /// directly, without [`NonBlocking`].
  ///
  /// [write]: std::io::Write
  