Document 404 when no renderers found

[93578237]

DRF can raise 404 if no renderers found (like if you pass ?format=INCORRECT_VALUE).
ref: https://github.com/encode/django-rest-framework/blob/365d409adb43ebad7d8a42cab2407ec841d8038e/rest_framework/negotiation.py#L87

[ghazi-git]

Thank you for opening the issue, the fix will be part of the next release