move ref into inline comments

lib/gat/client.go

lib/gat/server.go

rust_ref/.dockerignore

rust_ref/CONTRIBUTING.md

rust_ref/Cargo.lock

rust_ref/Cargo.toml

rust_ref/Dockerfile

rust_ref/Dockerfile.ci

rust_ref/LICENSE

rust_ref/README.md

rust_ref/docker-compose.yml

rust_ref/examples/docker/pgcat.toml

rust_ref/pgcat.toml

rust_ref/src/admin.rs

rust_ref/src/client.rs

rust_ref/src/config.rs

rust_ref/src/constants.rs

rust_ref/src/errors.rs

rust_ref/src/main.rs

rust_ref/src/messages.rs