Update properties docs (#4571)
Update properties docs (#4571)

Update properties.pyx

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