Show hint about double tap in example. closes #4489
Show hint about double tap in example. closes #4489

And varios pep 8 fixes

darkopevec/kivy,matham/kivy,bionoid/kivy,akshayaurora/kivy,rnixx/kivy,manthansharma/kivy,kived/kivy,akshayaurora/kivy,jegger/kivy,Cheaterman/kivy,kivy/kivy,manthansharma/kivy,janssen/kivy,tony/kivy,KeyWeeUsr/kivy,jkankiewicz/kivy,kivy/kivy,bionoid/kivy,janssen/kivy,KeyWeeUsr/kivy,aron-bordin/kivy,rnixx/kivy,jegger/kivy,LogicalDash/kivy,akshayaurora/kivy,janssen/kivy,jegger/kivy,inclement/kivy,autosportlabs/kivy,jkankiewicz/kivy,tony/kivy,LogicalDash/kivy,bionoid/kivy,kivy/kivy,rnixx/kivy,inclement/kivy,autosportlabs/kivy,inclement/kivy,manthansharma/kivy,bionoid/kivy,LogicalDash/kivy,rafalo1333/kivy,darkopevec/kivy,rafalo1333/kivy,aron-bordin/kivy,tony/kivy,KeyWeeUsr/kivy,matham/kivy,autosportlabs/kivy,jegger/kivy,jkankiewicz/kivy,aron-bordin/kivy,kived/kivy,aron-bordin/kivy,Cheaterman/kivy,janssen/kivy,kived/kivy,jkankiewicz/kivy,matham/kivy,KeyWeeUsr/kivy,darkopevec/kivy,darkopevec/kivy,Cheaterman/kivy,matham/kivy,rafalo1333/kivy,manthansharma/kivy,LogicalDash/kivy,Cheaterman/kivy