[Documentation][Book] Upgrading - small fix
[Documentation][Book] Upgrading - small fix

TheMadeleine/Sylius,CoderMaggie/Sylius,Mozan/Sylius,Pitoune/Sylius,Brille24/Sylius,ylastapis/Sylius,mkilmanas/Sylius,Zales0123/Sylius,gmoigneu/platformsh-integrations,MichaelKubovic/Sylius,TheMadeleine/Sylius,lchrusciel/Sylius,gruberro/Sylius,NeverResponse/Sylius,Sylius/Sylius,cdaguerre/Sylius,psren/Sylius,gmoigneu/platformsh-integrations,NeverResponse/Sylius,SyliusBot/Sylius,101medialab/Sylius,mbabker/Sylius,dragosprotung/Sylius,mheki/Sylius,Niiko/Sylius,diimpp/Sylius,gseidel/Sylius,mheki/Sylius,danut007ro/Sylius,torinaki/Sylius,regnisolbap/Sylius,psren/Sylius,TheMadeleine/Sylius,antonioperic/Sylius,pjedrzejewski/Sylius,venyii/Sylius,SyliusBot/Sylius,gabiudrescu/Sylius,Mozan/Sylius,Joypricecorp/Sylius,Sylius/Sylius,danut007ro/Sylius,Arminek/Sylius,videni/Sylius,pamil/Sylius,danut007ro/Sylius,gabiudrescu/Sylius,psren/Sylius,101medialab/Sylius,loic425/Sylius,gorkalaucirica/Sylius,videni/Sylius,inssein/Sylius,dragosprotung/Sylius,Sylius/Sylius,CoderMaggie/Sylius,MichaelKubovic/Sylius,michalmarcinkowski/Sylius,kayue/Sylius,mbabker/Sylius,mbabker/Sylius,Arminek/Sylius,regnisolbap/Sylius,DorianCMore/Sylius,Niiko/Sylius,NeverResponse/Sylius,antonioperic/Sylius,psren/Sylius,venyii/Sylius,vihuvac/Sylius,Pitoune/Sylius,bretto36/Sylius,Zales0123/Sylius,mkilmanas/Sylius,Mozan/Sylius,venyii/Sylius,regnisolbap/Sylius,DorianCMore/Sylius,bitbager/Sylius,gseidel/Sylius,cdaguerre/Sylius,regnisolbap/Sylius,Mozan/Sylius,Zales0123/Sylius,inssein/Sylius,ylastapis/Sylius,GSadee/Sylius,loic425/Sylius,mkilmanas/Sylius,ezecosystem/Sylius,DorianCMore/Sylius,itinance/Sylius,mkilmanas/Sylius,inssein/Sylius,diimpp/Sylius,ktzouno/Sylius,ktzouno/Sylius,gruberro/Sylius,pamil/Sylius,CoderMaggie/Sylius,torinaki/Sylius,bitbager/Sylius,gabiudrescu/Sylius,bretto36/Sylius,mheki/Sylius,Mozan/Sylius,Brille24/Sylius,ktzouno/Sylius,ylastapis/Sylius,danut007ro/Sylius,ezecosystem/Sylius,Brille24/Sylius,TheMadeleine/Sylius,itinance/Sylius,Niiko/Sylius,ktzouno/Sylius,SyliusBot/Sylius,ezecosystem/Sylius,Pitoune/Sylius,diimpp/Sylius,Joypricecorp/Sylius,gorkalaucirica/Sylius,pjedrzejewski/Sylius,torinaki/Sylius,vihuvac/Sylius,foobarflies/Sylius,videni/Sylius,cdaguerre/Sylius,Niiko/Sylius,michalmarcinkowski/Sylius,pjedrzejewski/Sylius,lchrusciel/Sylius,ylastapis/Sylius,Joypricecorp/Sylius,vihuvac/Sylius,antonioperic/Sylius,foobarflies/Sylius,pjedrzejewski/Sylius,gruberro/Sylius,NeverResponse/Sylius,ezecosystem/Sylius,kayue/Sylius,torinaki/Sylius,gseidel/Sylius,kayue/Sylius,gmoigneu/platformsh-integrations,MichaelKubovic/Sylius,Joypricecorp/Sylius,pamil/Sylius,videni/Sylius,dragosprotung/Sylius,inssein/Sylius,CoderMaggie/Sylius,gseidel/Sylius,gabiudrescu/Sylius,gorkalaucirica/Sylius,vihuvac/Sylius,gruberro/Sylius,itinance/Sylius,michalmarcinkowski/Sylius,foobarflies/Sylius,mheki/Sylius,venyii/Sylius,bitbager/Sylius,gorkalaucirica/Sylius,bretto36/Sylius,lchrusciel/Sylius,bitbager/Sylius,mbabker/Sylius,Pitoune/Sylius,foobarflies/Sylius,cdaguerre/Sylius,MichaelKubovic/Sylius,101medialab/Sylius,GSadee/Sylius,itinance/Sylius,cdaguerre/Sylius,DorianCMore/Sylius,Arminek/Sylius,Brille24/Sylius,gmoigneu/platformsh-integrations,dragosprotung/Sylius,michalmarcinkowski/Sylius,bretto36/Sylius,loic425/Sylius,GSadee/Sylius