Document ResourceBase::getRouteResourceTypes()

OPned https://git.drupalcode.org/project/jsonapi_resources/-/merge_requests/8

Finally, this method seems to read the '_jsonapi_resource_types' property of a route. I'd like to see documented how that can be used, maybe even with some example code.

It's briefly described, like the exception in the code. There are examples in the tests.

Automatically closed - issue fixed for 2 weeks with no activity.