Improved a docstring
Improved a docstring


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Former-commit-id: f3f273e2b984f52c5db9eec6cb911decddfcbc7c
Former-commit-id: 72b0d318a585688554b18df865543520d1a15142
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine