Fixed docstring [skip CI]
Fixed docstring [skip CI]


Former-commit-id: 45526645d5c686f94754c9dcd357065b6c66d278 [formerly 9347ba239c97eb624f0ed0e3b914b7bea416d10b]
Former-commit-id: 49fb2a7741d4ebb2636bec35f4632cca7bcb450c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine