Revert "fix(docs): remove mapDispatchToProps invalid use case" (#1365)

This reverts commit ae6f033.

Author: markerikson

docs/using-react-redux/connect-dispatching-actions-with-mapDispatchToProps.md

@@ -254,6 +254,22 @@ connect(
 )(Counter)
 ```
 
+### Manually Injecting `dispatch`
+
+If the `mapDispatchToProps` argument is supplied, the component will no longer receive the default `dispatch`. You may bring it back by adding it manually to the return of your `mapDispatchToProps`, although most of the time you shouldn’t need to do this:
+
+```js
+import { bindActionCreators } from 'redux'
+// ...
+
+function mapDispatchToProps(dispatch) {
+  return {
+    dispatch,
+    ...bindActionCreators({ increment, decrement, reset }, dispatch)
+  }
+}
+```
+
 ## Defining `mapDispatchToProps` As An Object
 
 You’ve seen that the setup for dispatching Redux actions in a React component follows a very similar process: define an action creator, wrap it in another function that looks like `(…args) => dispatch(actionCreator(…args))`, and pass that wrapper function as a prop to your component.