Missing state options of api resource document

[vuongxuongminh]

Hi, I saw the introduction on how to use stateOptions with entityClass of API resource on Symfonycast and just want to find the document for more information but I can not find it on https://api-platform.com/docs/

[vinceAmstoutz]

@vuongxuongminh You're welcome to contribute, check our CONTRIBUTING.md and submit your suggestions. Thanks!