JobConf docs: added warning about the differences with dict [ci skip]
JobConf docs: added warning about the differences with dict [ci skip]

mdrio/pydoop,crs4/pydoop,mdrio/pydoop,simleo/pydoop,ilveroluca/pydoop,kikkomep/pydoop,ilveroluca/pydoop,simleo/pydoop,elzaggo/pydoop,kikkomep/pydoop,kikkomep/pydoop,elzaggo/pydoop,simleo/pydoop,kikkomep/pydoop,mdrio/pydoop,simleo/pydoop,elzaggo/pydoop,mdrio/pydoop,ilveroluca/pydoop,mdrio/pydoop,ilveroluca/pydoop,crs4/pydoop,crs4/pydoop,crs4/pydoop,elzaggo/pydoop,elzaggo/pydoop,simleo/pydoop,ilveroluca/pydoop,kikkomep/pydoop,crs4/pydoop