Add missing docblock at `UnicodeString::$unicodeString`
Add missing docblock at `UnicodeString::$unicodeString`

osavchenko/SonataAdminBundle,greg0ire/SonataAdminBundle,osavchenko/SonataAdminBundle,osavchenko/SonataAdminBundle,jordisala1991/SonataAdminBundle,Armstrong1992/SonataAdminBundle,greg0ire/SonataAdminBundle,osavchenko/SonataAdminBundle,peter-gribanov/SonataAdminBundle,sonata-project/SonataAdminBundle,osavchenko/SonataAdminBundle,greg0ire/SonataAdminBundle,peter-gribanov/SonataAdminBundle,greg0ire/SonataAdminBundle,peter-gribanov/SonataAdminBundle,sonata-project/SonataAdminBundle,jordisala1991/SonataAdminBundle,peter-gribanov/SonataAdminBundle,jordisala1991/SonataAdminBundle,Armstrong1992/SonataAdminBundle,jordisala1991/SonataAdminBundle