fix doc typo (#6984)
fix doc typo (#6984)


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