fix: remove dot notation on MyNat.succ (#119)

Game/MyNat/Definition.lean

@@ -6,6 +6,8 @@ inductive MyNat where
 | succ : MyNat → MyNat
 -- deriving BEq, DecidableEq, Inhabited
 
+attribute [pp_nodot] MyNat.succ
+
 @[inherit_doc]
 notation (name := MyNatNotation) (priority := 1000000) "ℕ" => MyNat
 -- Note: as long as we do not import `Mathlib.Init.Data.Nat.Notation` this is fine.