Update hoomd/md/methods/rattle.py
Update hoomd/md/methods/rattle.py

fix typo

Co-authored-by: tommy-waltmann <9b8bdfc55c64e84a8465bfc1f3559b29c09f1b9c@users.noreply.github.com>
joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue