update quick install docs
update quick install docs

walshjon/openmc,shikhar413/openmc,paulromano/openmc,liangjg/openmc,paulromano/openmc,smharper/openmc,walshjon/openmc,paulromano/openmc,walshjon/openmc,walshjon/openmc,smharper/openmc,paulromano/openmc,mit-crpg/openmc,smharper/openmc,liangjg/openmc,liangjg/openmc,amandalund/openmc,smharper/openmc,shikhar413/openmc,mit-crpg/openmc,mit-crpg/openmc,shikhar413/openmc,shikhar413/openmc,liangjg/openmc,amandalund/openmc,amandalund/openmc,amandalund/openmc,mit-crpg/openmc