doc: changed 'C language' reference to Cython
doc: changed 'C language' reference to Cython

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