Reorganize UPGRADE-1.9 file to extract steps for Symfony v5.2
Reorganize UPGRADE-1.9 file to extract steps for Symfony v5.2

Arminek/Sylius,101medialab/Sylius,101medialab/Sylius,lchrusciel/Sylius,SyliusBot/Sylius,GSadee/Sylius,Zales0123/Sylius,loic425/Sylius,lchrusciel/Sylius,pamil/Sylius,loic425/Sylius,101medialab/Sylius,diimpp/Sylius,pamil/Sylius,Zales0123/Sylius,loic425/Sylius,Sylius/Sylius,Sylius/Sylius,GSadee/Sylius,diimpp/Sylius,lchrusciel/Sylius,SyliusBot/Sylius,Sylius/Sylius,antonioperic/Sylius,Arminek/Sylius,antonioperic/Sylius,GSadee/Sylius,diimpp/Sylius,pamil/Sylius,SyliusBot/Sylius,Arminek/Sylius,Zales0123/Sylius,antonioperic/Sylius