Updated invoice documentation
Updated invoice documentation

sonata-project/ecommerce,sonata-project/ecommerce,Soullivaneuh/sonata-ecommerce,Soullivaneuh/sonata-ecommerce,Soullivaneuh/sonata-ecommerce,sonata-project/ecommerce,sonata-project/ecommerce,Soullivaneuh/sonata-ecommerce