updated comments
updated comments


Former-commit-id: de7915fda452c75108f0313ea22c81fc73b964a8 [formerly c4783839c6f8100dee8a868c8cc43984065e96ea]
Former-commit-id: af454b59ce2c2bcc4ec543795c261d5529239fc9
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine