Clarify `otherwise` behavior in docs

Hi!
I'm using query _retry_ with a following scenario:
- fetch some resource
- if it's 500 or network error – retry as described
- otherwise (40x errors for instance) – call some event
Option _otherwise_ is supported in _retry_, but if the query is not passing the _filter_ then otherwise won't be called and for me it's a counterintuitive behavior.
Also there is also a minor typing issue with otherwise event being void typed.
`Type 'Event' is not assignable to type 'Event>>'.`

[Codesandbox reproduce link](https://codesandbox.io/s/young-mountain-wqhp0g?file=/src/App.tsx)