Add xml-parser docs link

Author: giansalex

README.md

@@ -5,5 +5,5 @@
 Convierte XML de comprobantes electrónicos a clases de PHP.
 
 ## Recursos
-- [Documentación](https://greenter.dev/)
+- [Documentación](https://greenter.dev/packages/xml-parser/)
 - [Reportar un error](https://github.com/thegreenter/greenter/issues) o enviar un [pull request](https://github.com/thegreenter/greenter/pulls) al [repositorio principal de greenter](https://github.com/thegreenter/greenter).