doc: fix typo
doc: fix typo

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