prod/doc/Makefile: added "spotless"; cleaned up generated/downloaded/orig logic
prod/doc/Makefile: added "spotless"; cleaned up generated/downloaded/orig logic

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan