See https://github.com/NeurodataWithoutBorders/nwb-schema/issues/621 Use `sort_keys` used in https://github.com/hdmf-dev/hdmf/blob/8edb6d132ce813848ae65f407e49400401126bed/src/hdmf/spec/write.py#L44 in https://github.com/hdmf-dev/hdmf-docutils/blob/06cedbbdad4378194eab66c47d51edda98810be7/hdmf_docutils/doctools/rst.py#L280
