fixing docstring
fixing docstring


Former-commit-id: a046d2d5b7b97ae8600689a55253d52a180a9e5d [formerly 0b747fbe60007850b42029225541ded004c07ccc]
Former-commit-id: 04cadf0e1f0b8efd9f833ac05500a31c0edc7ba9
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine