Clarify Pantheon provider documentation for D6/7 (#2956) [skip ci][ci skip]
Clarify Pantheon provider documentation for D6/7 (#2956) [skip ci][ci skip]


rfay/ddev,drud/ddev,drud/ddev,rfay/ddev,drud/ddev,rfay/ddev,rfay/ddev,drud/ddev,rfay/ddev,drud/ddev