Fixed a docstring
Fixed a docstring


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Former-commit-id: c412d55c66fd7f1c0c65af9e1eff359d219fe16f
Former-commit-id: 49bd4dfe46b6fc58b58867eaab9df10e048cb235
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine