docs(dev guide): add instructions to update vendored openshift
docs(dev guide): add instructions to update vendored openshift

ashetty1/kedge,surajnarwade/kedge,kedgeproject/kedge,kadel/kedge,kedgeproject/kedge,surajnarwade/kedge,ashetty1/kedge,cdrage/kedge,cdrage/kedge,surajnarwade/kedge,cdrage/kedge,kadel/kedge,kedgeproject/kedge