rephrasing

Rephrased wording to specify that the `mapStateToProps` will be called via the store being updated.

Author: Alexander Glassford

docs/api.md

@@ -52,7 +52,7 @@ It does not modify the component class passed to it; instead, it *returns* a new
 <a id="connect-arguments"></a>
 #### Arguments
 
-* [`mapStateToProps(state, [ownProps]): stateProps`] \(*Function*): If a component is specified, it will subscribe to Redux store updates. Any time the component updates, `mapStateToProps` will be called. The results of `mapStateToProps` must be a plain object*, which will be merged into the component’s props. If you omit the component, it will not be subscribed to the Redux store. If `ownProps` is specified as a second argument, its value will be the props passed to your component, and `mapStateToProps` will be additionally re-invoked whenever the component receives new props (e.g. if props received from a parent component have shallowly changed, and you use the ownProps argument, mapStateToProps is re-evaluated).
+* [`mapStateToProps(state, [ownProps]): stateProps`] \(*Function*): If a component is specified, it will subscribe to Redux store updates. Any time the store is updated, `mapStateToProps` will be called. The results of `mapStateToProps` must be a plain object*, which will be merged into the component’s props. If you omit the component, it will not be subscribed to the Redux store. If `ownProps` is specified as a second argument, its value will be the props passed to your component, and `mapStateToProps` will be additionally re-invoked whenever the component receives new props (e.g. if props received from a parent component have shallowly changed, and you use the ownProps argument, mapStateToProps is re-evaluated).
 
   >Note: in advanced scenarios where you need more control over the rendering performance, `mapStateToProps()` can also return a function. In this case, *that* function will be used as `mapStateToProps()` for a particular component instance. This allows you to do per-instance memoization. You can refer to [#279](https://github.com/reactjs/react-redux/pull/279) and the tests it adds for more details. Most apps never need this.