Fixed a typo in docstring
Fixed a typo in docstring


Former-commit-id: 39f13972fedf90bc600a209ec1adbfc4c2fceb51 [formerly ec7b6725ba99be092404a09ed99cf0b57cc4f5a3] [formerly ec7b6725ba99be092404a09ed99cf0b57cc4f5a3 [formerly dbbec58df5e776593e24a3c2a9392f94b83491fd]]
Former-commit-id: ad561bb648e29d02ed0c2d1456f7f8d0e022c816
Former-commit-id: c7530bbff44b1ceb0f9479f95b873a6d1140c5f6
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine