🌐 Add Japanese translation for `docs/ja/docs/advanced/index.md` (#5043)
Co-authored-by: Amazyra <yamaguchi.tatsuya.27a@gmail.com>
Co-authored-by: tokusumi <41147016+tokusumi@users.noreply.github.com>
Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
