doc: added kv styling to code blocks in properties.pyx
doc: added kv styling to code blocks in properties.pyx

jkankiewicz/kivy,LogicalDash/kivy,youprofit/kivy,thezawad/kivy,Cheaterman/kivy,thezawad/kivy,cbenhagen/kivy,jegger/kivy,rnixx/kivy,bionoid/kivy,xpndlabs/kivy,Shyam10/kivy,KeyWeeUsr/kivy,rafalo1333/kivy,yoelk/kivy,aron-bordin/kivy,bhargav2408/kivy,aron-bordin/kivy,janssen/kivy,aron-bordin/kivy,autosportlabs/kivy,jehutting/kivy,tony/kivy,andnovar/kivy,cbenhagen/kivy,manthansharma/kivy,darkopevec/kivy,darkopevec/kivy,tony/kivy,janssen/kivy,LogicalDash/kivy,ernstp/kivy,janssen/kivy,akshayaurora/kivy,xiaoyanit/kivy,ernstp/kivy,manashmndl/kivy,Ramalus/kivy,edubrunaldi/kivy,manashmndl/kivy,bionoid/kivy,VinGarcia/kivy,arlowhite/kivy,VinGarcia/kivy,kivy/kivy,cbenhagen/kivy,jehutting/kivy,Ramalus/kivy,Cheaterman/kivy,youprofit/kivy,habibmasuro/kivy,akshayaurora/kivy,xpndlabs/kivy,el-ethan/kivy,edubrunaldi/kivy,jffernandez/kivy,Ramalus/kivy,bliz937/kivy,jegger/kivy,Shyam10/kivy,habibmasuro/kivy,jffernandez/kivy,MiyamotoAkira/kivy,CuriousLearner/kivy,LogicalDash/kivy,MiyamotoAkira/kivy,manthansharma/kivy,thezawad/kivy,CuriousLearner/kivy,mSenyor/kivy,xpndlabs/kivy,bhargav2408/kivy,matham/kivy,yoelk/kivy,el-ethan/kivy,Cheaterman/kivy,andnovar/kivy,LogicalDash/kivy,tony/kivy,matham/kivy,xiaoyanit/kivy,darkopevec/kivy,kived/kivy,KeyWeeUsr/kivy,kivy/kivy,yoelk/kivy,darkopevec/kivy,rafalo1333/kivy,xiaoyanit/kivy,iamutkarshtiwari/kivy,KeyWeeUsr/kivy,viralpandey/kivy,Shyam10/kivy,kived/kivy,inclement/kivy,MiyamotoAkira/kivy,rafalo1333/kivy,mSenyor/kivy,aron-bordin/kivy,viralpandey/kivy,autosportlabs/kivy,iamutkarshtiwari/kivy,jkankiewicz/kivy,youprofit/kivy,vitorio/kivy,manthansharma/kivy,CuriousLearner/kivy,KeyWeeUsr/kivy,mSenyor/kivy,iamutkarshtiwari/kivy,arlowhite/kivy,kived/kivy,manthansharma/kivy,jegger/kivy,jkankiewicz/kivy,Cheaterman/kivy,matham/kivy,jffernandez/kivy,arlowhite/kivy,bionoid/kivy,MiyamotoAkira/kivy,vitorio/kivy,bionoid/kivy,habibmasuro/kivy,jffernandez/kivy,viralpandey/kivy,jegger/kivy,ernstp/kivy,rnixx/kivy,manashmndl/kivy,jehutting/kivy,janssen/kivy,Shyam10/kivy,yoelk/kivy,autosportlabs/kivy,matham/kivy,akshayaurora/kivy,bliz937/kivy,inclement/kivy,edubrunaldi/kivy,andnovar/kivy,VinGarcia/kivy,kivy/kivy,bliz937/kivy,vitorio/kivy,bhargav2408/kivy,rnixx/kivy,jkankiewicz/kivy,el-ethan/kivy,ernstp/kivy,inclement/kivy