### Docs

* 📝 Update docs and examples for Response Model with Return Type Annotations, and update runtime error. PR [#5873](https://github.com/tiangolo/fastapi/pull/5873) by [@tiangolo](https://github.com/tiangolo). New docs at [Response Model - Return Type: Other Return Type Annotations](https://fastapi.tiangolo.com/tutorial/response-model/#other-return-type-annotations).

class ResponseLevel0(JSONResponse):
    media_type = "application/x-level-0"


class ResponseLevel1(JSONResponse):
    media_type = "application/x-level-1"


class ResponseLevel2(JSONResponse):
    media_type = "application/x-level-2"


class ResponseLevel3(JSONResponse):
    media_type = "application/x-level-3"


class ResponseLevel4(JSONResponse):
    media_type = "application/x-level-4"