message: tracing: Remove "describing" since it's unnecessary
  Just a quick fix to your docs :)
diff: //! - An [`Id`] assigned by the subscriber that uniquely identifies it in relation
  //! to other spans.
  //! - The span's [parent] in the trace tree.
  -//! - [Metadata] describing that describes static characteristics of all spans
  +//! - [Metadata] that describes static characteristics of all spans
  //! originating from that callsite, such as its name, source code location,
  //! [verbosity level], and the names of its fields.
  //!
  