Add docs for `React.Children.toArray` in 0.14.0.

* Update the docs to change return type of `React.Children.map` from `object` to `array`.

docs/ref-01-top-level-api.md

@@ -97,10 +97,10 @@ Verifies the object is a ReactElement.
 #### React.Children.map
 
 ```javascript
-object React.Children.map(object children, function fn [, object thisArg])
+array React.Children.map(object children, function fn [, object thisArg])
 ```
 
-Invoke `fn` on every immediate child contained within `children` with `this` set to `thisArg`. If `children` is a nested object or array it will be traversed: `fn` will never be passed the container objects. If children is `null` or `undefined` returns `null` or `undefined` rather than an empty object.
+Invoke `fn` on every immediate child contained within `children` with `this` set to `thisArg`. If `children` is a nested object or array it will be traversed: `fn` will never be passed the container objects. If children is `null` or `undefined` returns `null` or `undefined` rather than an array.
 
 #### React.Children.forEach
 
@@ -108,7 +108,7 @@ Invoke `fn` on every immediate child contained within `children` with `this` set
 React.Children.forEach(object children, function fn [, object thisArg])
 ```
 
-Like `React.Children.map()` but does not return an object.
+Like `React.Children.map()` but does not return an array.
 
 #### React.Children.count
 
@@ -126,6 +126,14 @@ object React.Children.only(object children)
 
 Return the only child in `children`. Throws otherwise.
 
+#### React.Children.toArray
+
+```javascript
+array React.Children.toArray(object children)
+```
+
+Return the `children` opaque data structure as a flat array with keys assigned to each child. Useful if you want to manipulate collections of children in your render methods, especially if you want to reorder or slice `this.props.children` before passing it down.
+
 ## ReactDOM
 
 The `react-dom` package provides DOM-specific methods that can be used at the top level of your app and as an escape hatch to get outside of the React model if you need to. Most of your components should not need to use this module.