Updated a docstring [skip CI]
Updated a docstring [skip CI]


Former-commit-id: ce59653d5787794e1cccd7b330c969bce3df6aa3 [formerly a1f15894c8f32d77597ee4635bc2d19a8aa08574]
Former-commit-id: b45f59101311c7be7cb3bb95fff43456f1db61d9
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine