Update rhel.md
Update rhel.md

Former-commit-id: 78f5118dcfdf7e9abbd044f287f15c565b3b9573 [formerly c2c0025aa682732a717cd8f1bbee34757ae0d44f]
Former-commit-id: 0cc942ac43b7e0fa065eb1fd834ab1fd81375d99
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine