message: tracing: Add link to examples directory from README
  Follow-up of as suggested here:
  This adds a link to the examples directory, located in the root of the
  repository, in the README of the `tracing` crate.
diff: @@ -169,7 +169,7 @@ impl Yak { fn shave(&mut self, _: u32) {} }
  fn find_a_razor() -> Result<u32, u32> { Ok(1) }
  ```
  -You can find further examples showing how to use this crate in the examples
  +You can find further examples showing how to use this crate in the [`examples`]
  directory.
  ### In libraries
  @@ -291,6 +291,7 @@ undergoing active development. They may be less stable than `tracing` and
  [`tracing-timing`]: https://crates.io/crates/tracing-timing
  [`env_logger`]: https://crates.io/crates/env_logger
  [`FmtSubscriber`]: https://docs.rs/tracing-subscriber/latest/tracing_subscriber/fmt/struct.Subscriber.html
  +[`examples`]: https://github.com/tokio-rs/tracing/tree/master/examples
  ## License
  