message: Update src/cargo/ops/fix.rs
  Fix typo.
diff: //! High-level overview of how `fix` works:
  //!
  //! The main goal is to run `cargo check` to get rustc to emit JSON
  -//! diagnostics with suggested fixes that can be applied to the files an the
  +//! diagnostics with suggested fixes that can be applied to the files on the
  //! filesystem, and validate that those changes didn't break anything.
  //!
  //! Cargo begins by launching a `LockServer` thread in the background to
  