doc: clarifications in source/guide/lang.py
doc: clarifications in source/guide/lang.py

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