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


Former-commit-id: 57dae7c439cd9698b4dc2bde076b2ef67f6c5c5b [formerly 04391f959120c1f44835540b01dbb6af441c4f23]
Former-commit-id: 57fe7c1b11369a74a02e59b2ceb4114711b9bb92
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine