Summary:
## Changes in this pull request
Updates the IGListKit docs to the latest API spec in v5.2.0
### Checklist
- [x] All tests pass. Demo project builds and runs.
- [x] I added tests, an experiment, or detailed why my change isn't tested.
- [x] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes.
- [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/main/.github/CONTRIBUTING.md)
Pull Request resolved: https://github.com/instagram/IGListKit/pull/1656
Reviewed By: jurmarcus
Differential Revision: D93350284
Pulled By: TimOliver
fbshipit-source-id: fa4276caae7309f3ef0fd78f5a0c4bcc05d9cb9f