Fixed two docstrings [skip CI]
Fixed two docstrings [skip CI]


Former-commit-id: c441e2b7454d01d400da25aba64bac758b515950 [formerly b2851c4e1b2712327ba20b3c3831b0d744ac3bfb]
Former-commit-id: 5a73d3961b5b156314c7c28d341c866e3e2d6438
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine