Docstring typo fix
Docstring typo fix


Former-commit-id: 629f080dbac9945bee6ba479159af8040c33889d [formerly b272cea9882127c0576b8c6e80665c3130923a0d]
Former-commit-id: b3443c5e9a48c8be7873af54793ec338410fdc9d
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine