Updated a docstring
Updated a docstring


Former-commit-id: 71b170510b04ad8094d1d169f1796be1fbe42eb3 [formerly cb7d5474a7ecaacaeaad80e29b7a2c2acbd2d871]
Former-commit-id: 2791a60c4cc2c3f315a999018c8d1d4517da16df
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine