doc: Add clean targets
doc: Add clean targets

idontgetoutmuch/haddock,Fuuzetsu/haddock,Fuuzetsu/haddock,haskell/haddock,haskell/haddock,niteria/haddock,Helkafen/haddock,niteria/haddock,idontgetoutmuch/haddock,haskell/haddock,Helkafen/haddock,niteria/haddock,idontgetoutmuch/haddock,haskell/haddock,Fuuzetsu/haddock,Fuuzetsu/haddock,haskell/haddock,Helkafen/haddock