[docs] Improve docs for PR testing, add step for checking (#3807) [skip ci]
[docs] Improve docs for PR testing, add step for checking (#3807) [skip ci]


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