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


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Former-commit-id: c26853f1b4541bf2c88b7d6bbc707b258fc32220
Former-commit-id: 4882dec51c939deae982e1c793a7cc01745417de
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine