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


Former-commit-id: 9bfbc9d057b7b0b69cfc31c293dbd1b5126639d4 [formerly 1dc0551918338c565a2e492ebb57c880dcba749e]
Former-commit-id: 6a5ac5834f6192aed695a49911dc719589d63840
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine