Update installation.rst
Update installation.rst

Added second occurrence of use Doctrine\ORM\EntityManager;
Mozan/Sylius,gseidel/Sylius,videni/Sylius,Brille24/Sylius,gruberro/Sylius,gruberro/Sylius,tuka217/Sylius,danut007ro/Sylius,juramy/Sylius,Ejobs/Sylius,ylastapis/Sylius,danut007ro/Sylius,okwinza/Sylius,Mozan/Sylius,TeamNovatek/Sylius,diimpp/Sylius,coudenysj/Sylius,polisys/Sylius,jjanvier/Sylius,videni/Sylius,bretto36/Sylius,DorianCMore/Sylius,gorkalaucirica/Sylius,vihuvac/Sylius,rpg600/Sylius,ktzouno/Sylius,jjanvier/Sylius,michalmarcinkowski/Sylius,NeverResponse/Sylius,michalmarcinkowski/Sylius,psyray/Sylius,polisys/Sylius,psren/Sylius,psyray/Sylius,jvahldick/Sylius,jjanvier/Sylius,Rvanlaak/Sylius,cdaguerre/Sylius,ReissClothing/Sylius,ktzouno/Sylius,Zales0123/Sylius,polisys/Sylius,venyii/Sylius,patrick-mcdougle/Sylius,Ejobs/Sylius,axelvnk/Sylius,fredcollet/Sylius,gorkalaucirica/Sylius,gabiudrescu/Sylius,adamelso/Sylius,NeverResponse/Sylius,jjanvier/Sylius,jjanvier/Sylius,fredcollet/Sylius,101medialab/Sylius,patrick-mcdougle/Sylius,foobarflies/Sylius,ezecosystem/Sylius,Sylius/Sylius,Ejobs/Sylius,adamelso/Sylius,bitbager/Sylius,Arminek/Sylius,rpg600/Sylius,cdaguerre/Sylius,tuka217/Sylius,101medialab/Sylius,coudenysj/Sylius,DorianCMore/Sylius,ravaj-group/Sylius,gruberro/Sylius,cdaguerre/Sylius,davalb/Sylius,ReissClothing/Sylius,ravaj-group/Sylius,Arminek/Sylius,Brille24/Sylius,gabiudrescu/Sylius,Joypricecorp/Sylius,Brille24/Sylius,PyRowMan/Sylius,foobarflies/Sylius,mheki/Sylius,inssein/Sylius,mbabker/Sylius,okwinza/Sylius,diimpp/Sylius,mheki/Sylius,axelvnk/Sylius,ktzouno/Sylius,gorkalaucirica/Sylius,regnisolbap/Sylius,dragosprotung/Sylius,pjedrzejewski/Sylius,steffenbrem/Sylius,TeamNovatek/Sylius,ravaj-group/Sylius,michalmarcinkowski/Sylius,gmoigneu/platformsh-integrations,CoderMaggie/Sylius,TeamNovatek/Sylius,kayue/Sylius,vihuvac/Sylius,Lowlo/Sylius,videni/Sylius,lchrusciel/Sylius,Ejobs/Sylius,Brille24/Sylius,MichaelKubovic/Sylius,Niiko/Sylius,regnisolbap/Sylius,ezecosystem/Sylius,antonioperic/Sylius,torinaki/Sylius,gabiudrescu/Sylius,polisys/Sylius,coudenysj/Sylius,tuka217/Sylius,dragosprotung/Sylius,Niiko/Sylius,foobarflies/Sylius,patrick-mcdougle/Sylius,itinance/Sylius,pamil/Sylius,danut007ro/Sylius,fredcollet/Sylius,MichaelKubovic/Sylius,pjedrzejewski/Sylius,rpg600/Sylius,gseidel/Sylius,juramy/Sylius,TheMadeleine/Sylius,adamelso/Sylius,DorianCMore/Sylius,bitbager/Sylius,steffenbrem/Sylius,TeamNovatek/Sylius,psren/Sylius,gmoigneu/platformsh-integrations,regnisolbap/Sylius,ReissClothing/Sylius,Zales0123/Sylius,ReissClothing/Sylius,tuka217/Sylius,bitbager/Sylius,fredcollet/Sylius,venyii/Sylius,Ejobs/Sylius,psyray/Sylius,okwinza/Sylius,Rvanlaak/Sylius,coudenysj/Sylius,NeverResponse/Sylius,loic425/Sylius,mbabker/Sylius,gmoigneu/platformsh-integrations,CoderMaggie/Sylius,rpg600/Sylius,mheki/Sylius,PyRowMan/Sylius,SyliusBot/Sylius,gmoigneu/platformsh-integrations,jvahldick/Sylius,bretto36/Sylius,ezecosystem/Sylius,davalb/Sylius,pjedrzejewski/Sylius,dragosprotung/Sylius,antonioperic/Sylius,bretto36/Sylius,nakashu/Sylius,TheMadeleine/Sylius,Rvanlaak/Sylius,Joypricecorp/Sylius,Sylius/Sylius,gabiudrescu/Sylius,steffenbrem/Sylius,davalb/Sylius,cdaguerre/Sylius,patrick-mcdougle/Sylius,PyRowMan/Sylius,psren/Sylius,gseidel/Sylius,coudenysj/Sylius,kayue/Sylius,itinance/Sylius,regnisolbap/Sylius,danut007ro/Sylius,gruberro/Sylius,pamil/Sylius,Lowlo/Sylius,bretto36/Sylius,MichaelKubovic/Sylius,ktzouno/Sylius,ylastapis/Sylius,cdaguerre/Sylius,steffenbrem/Sylius,venyii/Sylius,TeamNovatek/Sylius,inssein/Sylius,NeverResponse/Sylius,juramy/Sylius,pamil/Sylius,mkilmanas/Sylius,foobarflies/Sylius,jvahldick/Sylius,axelvnk/Sylius,gorkalaucirica/Sylius,Niiko/Sylius,adamelso/Sylius,nakashu/Sylius,polisys/Sylius,SyliusBot/Sylius,mheki/Sylius,davalb/Sylius,loic425/Sylius,Pitoune/Sylius,ravaj-group/Sylius,mkilmanas/Sylius,CoderMaggie/Sylius,PyRowMan/Sylius,CoderMaggie/Sylius,dragosprotung/Sylius,Arminek/Sylius,Mozan/Sylius,ezecosystem/Sylius,sweoggy/Sylius,axelvnk/Sylius,fredcollet/Sylius,Pitoune/Sylius,torinaki/Sylius,Joypricecorp/Sylius,Mozan/Sylius,psyray/Sylius,itinance/Sylius,gseidel/Sylius,Rvanlaak/Sylius,GSadee/Sylius,psren/Sylius,diimpp/Sylius,patrick-mcdougle/Sylius,okwinza/Sylius,loic425/Sylius,nakashu/Sylius,sweoggy/Sylius,okwinza/Sylius,videni/Sylius,kayue/Sylius,mkilmanas/Sylius,mbabker/Sylius,ylastapis/Sylius,adamelso/Sylius,bitbager/Sylius,michalmarcinkowski/Sylius,Zales0123/Sylius,SyliusBot/Sylius,inssein/Sylius,juramy/Sylius,torinaki/Sylius,Joypricecorp/Sylius,Pitoune/Sylius,vihuvac/Sylius,GSadee/Sylius,Lowlo/Sylius,jvahldick/Sylius,psyray/Sylius,ravaj-group/Sylius,101medialab/Sylius,mkilmanas/Sylius,steffenbrem/Sylius,juramy/Sylius,MichaelKubovic/Sylius,inssein/Sylius,lchrusciel/Sylius,lchrusciel/Sylius,ylastapis/Sylius,Lowlo/Sylius,tuka217/Sylius,sweoggy/Sylius,Niiko/Sylius,DorianCMore/Sylius,nakashu/Sylius,torinaki/Sylius,pjedrzejewski/Sylius,Rvanlaak/Sylius,mbabker/Sylius,davalb/Sylius,GSadee/Sylius,ReissClothing/Sylius,TheMadeleine/Sylius,axelvnk/Sylius,venyii/Sylius,itinance/Sylius,Mozan/Sylius,Pitoune/Sylius,rpg600/Sylius,vihuvac/Sylius,sweoggy/Sylius,TheMadeleine/Sylius,antonioperic/Sylius,Sylius/Sylius