JSON API Reference is missing information on metadata 2.2 and 2.3 fields

[dralley]

Describe the bug

This JSON API reference: https://github.com/pypi/warehouse/blob/main/docs/dev/api-reference/json.rst

Is missing documentation on the "dynamic" and "provides_extra" fields, added in versions 2.2 and 2.3 of the core metadata specification (https://packaging.python.org/en/latest/specifications/core-metadata/).

The example output shown in the reference is missing them entirely, yet they can currently be seen if you query the JSON API.

Expected behavior API reference should include these fields