Tick DateOffset Normalize whatsnew entry has an error
http://pandas-docs.github.io/pandas-docs-travis/whatsnew.html#tick-dateoffset-normalize-restrictions

- [x] These :class: refs don't resolve. We probably need to add offsets to `api.rst` and update the references to `tseries.offsets.Day`, etc. (#21586)
- [ ] ` tic = pd.offsets.Hour(n=2, normalize=True)` throws an exception.