Small doc fixes [skip CI]
Small doc fixes [skip CI]


Former-commit-id: 4fe31873daa46c545274cf33ca83595c3c37e13f [formerly 6b7df72ea16e99ef95d18391c3f8a986c7afb987]
Former-commit-id: 5ba0712003d83dd52df1f42ff8c536270d059cc0
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine