Add missing upgrade note from #6537
Add missing upgrade note from #6537

osavchenko/SonataAdminBundle,osavchenko/SonataAdminBundle,sonata-project/SonataAdminBundle,osavchenko/SonataAdminBundle,osavchenko/SonataAdminBundle,osavchenko/SonataAdminBundle,sonata-project/SonataAdminBundle