doc: fix missing qoute4 in uix/image.py
doc: fix missing qoute4 in uix/image.py

LogicalDash/kivy,arlowhite/kivy,jkankiewicz/kivy,inclement/kivy,matham/kivy,kived/kivy,jegger/kivy,janssen/kivy,manthansharma/kivy,rafalo1333/kivy,darkopevec/kivy,CuriousLearner/kivy,Cheaterman/kivy,LogicalDash/kivy,janssen/kivy,manthansharma/kivy,LogicalDash/kivy,el-ethan/kivy,inclement/kivy,akshayaurora/kivy,aron-bordin/kivy,rnixx/kivy,jkankiewicz/kivy,autosportlabs/kivy,jkankiewicz/kivy,KeyWeeUsr/kivy,bionoid/kivy,tony/kivy,el-ethan/kivy,cbenhagen/kivy,CuriousLearner/kivy,matham/kivy,Cheaterman/kivy,autosportlabs/kivy,vitorio/kivy,jkankiewicz/kivy,rnixx/kivy,manthansharma/kivy,darkopevec/kivy,bionoid/kivy,darkopevec/kivy,tony/kivy,CuriousLearner/kivy,darkopevec/kivy,matham/kivy,andnovar/kivy,kivy/kivy,LogicalDash/kivy,inclement/kivy,aron-bordin/kivy,kivy/kivy,arlowhite/kivy,cbenhagen/kivy,rnixx/kivy,bionoid/kivy,cbenhagen/kivy,akshayaurora/kivy,jegger/kivy,Cheaterman/kivy,bionoid/kivy,KeyWeeUsr/kivy,kived/kivy,jegger/kivy,rafalo1333/kivy,matham/kivy,tony/kivy,el-ethan/kivy,jegger/kivy,andnovar/kivy,aron-bordin/kivy,KeyWeeUsr/kivy,autosportlabs/kivy,vitorio/kivy,janssen/kivy,kivy/kivy,KeyWeeUsr/kivy,rafalo1333/kivy,Cheaterman/kivy,arlowhite/kivy,manthansharma/kivy,janssen/kivy,kived/kivy,akshayaurora/kivy,aron-bordin/kivy,vitorio/kivy,andnovar/kivy