Update macos.md doc [skip ci]
Update macos.md doc [skip ci]

Former-commit-id: 554c7a0be10329a71bdf0b4544b24e77cf445517 [formerly 9768b5509e7f3fd3fe9498f91f01fcf65bdbc16d]
Former-commit-id: 47eb3291258b51c08d440d59c8c23958f2f2457b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine