message: docs(lib): fix misspelling
diff: //! ## "Low-level"
  //!
  //! hyper is a lower-level HTTP library, meant to be a building block
  -//! for libaries and applications.
  +//! for libraries and applications.
  //!
  //! If looking for just a convenient HTTP client, consider the
  //! [reqwest](https://crates.io/crates/reqwest) crate.
  