DOC: fix formatting / links of API refs in 1.0.2 whatsnew (#32620)
https://github.com/pandas-dev/pandas/pull/32620
Unrelated CI failure

```
2020-03-11T14:07:00.9385237Z WARNING: failed to reach any of the inventories with the following issues:
2020-03-11T14:07:00.9389172Z intersphinx inventory 'https://dateutil.readthedocs.io/en/latest/objects.inv' not fetchable due to <class 'requests.exceptions.HTTPError'>: 502 Server Error: Bad Gateway for url: https://dateutil.readthedocs.io/en/latest/objects.inv
```