Fix addons documentation of development only part

docs/docs/10-addons.md

@@ -11,13 +11,13 @@ next: animation.html
 - [`TransitionGroup` and `CSSTransitionGroup`](animation.html), for dealing with animations and transitions that are usually not simple to implement, such as before a component's removal.
 - [`LinkedStateMixin`](two-way-binding-helpers.html), to simplify the coordination between user's form input data and the component's state.
 - [`classSet`](class-name-manipulation.html), for manipulating the DOM `class` string a bit more cleanly.
-- [`TestUtils`](test-utils.html), simple helpers for writing test cases (unminified build only).
 - [`cloneWithProps`](clone-with-props.html), to make shallow copies of React components and change their props.
 - [`update`](update.html), a helper function that makes dealing with immutable data in JavaScript easier.
+- [`PureRenderMixin`](pure-render-mixin.html), a performance booster under certain situations.
 
 The add-ons below are in the development (unminified) version of React only:
 
-- [`PureRenderMixin`](pure-render-mixin.html), a performance booster under certain situations.
+- [`TestUtils`](test-utils.html), simple helpers for writing test cases (unminified build only).
 - [`Perf`](perf.html), for measuring performance and giving you hint where to optimize.
 
 To get the add-ons, use `react-with-addons.js` (and its minified counterpart) rather than the common `react.js`.