docs: Use correct arity for graphql_type (#212)

documentation/topics/use-enums-with-graphql.md

@@ -11,7 +11,7 @@ defmodule AshPostgres.Test.Types.Status do
   @moduledoc false
   use Ash.Type.Enum, values: [:open, :closed]
 
-  def graphql_type, do: :ticket_status
+  def graphql_type(_), do: :ticket_status
 
   # Optionally, remap the names used in GraphQL, for instance if you have a value like `:"10"`
   # that value is not compatible with GraphQL

documentation/topics/use-maps-with-graphql.md

@@ -18,7 +18,7 @@ defmodule MyApp.Types.Metadata do
     ]
   ]
 
-  def graphql_type, do: :metadata
+  def graphql_type(_), do: :metadata
 end
 
 ```