What docs page needs to be fixed?

• usage with typescript:
• typing create reducer:

https://redux.js.org/recipes/usage-with-typescript#typing-createreducer

What is the problem?

There is a reference to a generic type, PayloadAction, that doesn't exist on this repo and it doesn't explain where to get it from.

What should be changed to fix the problem?

It will be ideal to include such type as part of the package. If that is not possible, provide links to it's definition.