message: docs: document the default span level in #[instrument]
diff: @@ -99,6 +99,7 @@ use syn::{
  /// Instruments a function to create and enter a `tracing` [span] every time
  /// the function is called.
  ///
  +/// Unless overriden, a span with `info` level will be generated.
  /// The generated span's name will be the name of the function. Any arguments
  /// to that function will be recorded as fields using [`fmt::Debug`]. To skip
  /// recording a function's or method's argument, pass the argument's name
  @@ -248,7 +249,6 @@ use syn::{
  /// ```
  /// Instead, you should manually rewrite any `Self` types as the type for
  /// which you implement the trait: `#[instrument(fields(tmp = std::any::type_name::<Bar>()))]`.
  -
  ///
  /// [span]: https://docs.rs/tracing/latest/tracing/span/index.html
  /// [`tracing`]: https://github.com/tokio-rs/tracing
  