Add example and default value to radio buttons (#303)
Add example and default value to radio buttons (#303)

* Added example and default value to radiobuttons

* Fix none required radio buttons

Co-authored-by: Alexander Schranz <e46fc836cca3acec03944314d1457c2ae6c68ef3@sulu.io>
sulu/SuluFormBundle,sulu/SuluFormBundle