Bootstrapping the Core Library not up to date

Hello !

I'm trying to bootstrap api platform on a legacy vanilla php project that we do not want to migrate to symfony or laravel.

I read the documentation available here : [Bootstrapping the Core Library](https://api-platform.com/docs/core/bootstrap/)

If I understand well, the "minimal version of API Platform" seems outdated, many interfaces have changed, many classes are not located where they used to be.

I am trying to make it work, not knowing the code it is a bit complicated, could you update the doc ? Or, if so, tell me what I misunderstood ?

Thank you :)