message: Include note about bug while building on macOS in mdbook
diff: @@ -46,6 +46,11 @@ If you can successfully run `cargo build`, you should be good to go!
  [homebrew]: https://brew.sh/
  +Note: There is currently a bug on macOS that will cause an error while linking
  +cargo. To fix this, run `export MACOSX_DEPLOYMENT_TARGET=10.7` before attempting
  +to build the cargo project. For more information, see
  +[rust#90342](https://github.com/rust-lang/rust/issues/90342).
  +
  ## Running Cargo
  You can use `cargo run` to run cargo itself, or you can use the path directly
  