Fixed a docstring
Fixed a docstring


Former-commit-id: 53f214d467c5c086a7ffa9d2eb53a6e79345dddd [formerly 7b19ea18f99e7ac90f41a75cae63a37df1b27346]
Former-commit-id: d02b9824c39a288c0178c5f9e1da780f35997dda
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine