Add example to API docs for no-subscribe actions

[joshwcomeau]

In a recent project, I needed a container component that had access to a few actions, but it didn't need to subscribe to the store. The component was just a button that performed an action; it didn't care about what the state of the app was.

The docs for connect don't have an example for how to omit the mapStateToProps argument, while still providing a value for mapDispatchToProps.

I'm not entirely sure if this is the best way to accomplish that goal, so please do let me know if there's a better/simpler way! I tried simply passing a single mapDispatchToProps argument, but it was interpreted as the mapStateToProps param.

[gaearon]

We already have https://github.com/joshwcomeau/react-redux/blob/feature/injectActionsDocs/docs/api.md#inject-just-dispatch-and-dont-listen-to-store so maybe it’s worth putting the example next to it? Also let’s use null instead of false. Somehow that feels.. better.

[joshwcomeau]

Yeah, I didn't wanna be presumptuous by putting my example so close to the top, but I agree it makes more sense there.

Since it then became the first example to use import * as actionCreators, I moved the parentheses explaining that bit to it.

[gaearon]

Even better. Thanks!