chore: update doc

Signed-off-by: Norman Meier <norman@samourai.coop>

docs/how-to-guides/creating-dao.md

@@ -83,8 +83,8 @@ There is only one implementation currently, `gno.land/p/demo/teritori/dao_propos
 Proposals actions are encoded as objects implementing `gno.land/p/demo/teritori/dao_interfaces.ExecutableMessage`
 ```go
 type ExecutableMessage interface {
-	ujson.JSONAble
-	ujson.FromJSONAble
+	ToJSON() *json.Node
+	FromJSON(ast *json.Node)
 
 	String() string
 	Type() string
@@ -95,7 +95,7 @@ They are deserialized and executed by message handlers implementing `gno.land/p/
 ```go
 type MessageHandler interface {
 	Execute(message ExecutableMessage)
-	MessageFromJSON(ast *json.Node) ExecutableMessage
+	Instantiate() ExecutableMessage
 	Type() string
 }
 ```