Changed webpack's hyperlink (facebook#8650)

..to point to 2.x documentation instead of 1.x (and to be consistent with other links on the page)

Author: gitanupam

docs/docs/installation.md

@@ -42,7 +42,7 @@ We recommend adding React to a small part of your application, such an individua
 While React [can be used](/react/docs/react-without-es6.html) without a build pipeline, we recommend setting it up so you can be more productive. A modern build pipeline typically consists of:
 
 * A **package manager**, such as [Yarn](https://yarnpkg.com/) or [npm](https://www.npmjs.com/). It lets you take advantage of a vast ecosystem of third-party packages, and easily install or update them.
-* A **bundler**, such as [webpack](https://webpack.github.io/) or [Browserify](http://browserify.org/). It lets you write modular code and bundle it together into small packages to optimize load time.
+* A **bundler**, such as [webpack](https://webpack.js.org/) or [Browserify](http://browserify.org/). It lets you write modular code and bundle it together into small packages to optimize load time.
 * A **compiler** such as [Babel](http://babeljs.io/). It lets you write modern JavaScript code that still works in older browsers.
 
 ### Installing React
@@ -73,7 +73,7 @@ The [Babel setup instructions](https://babeljs.io/docs/setup/) explain how to co
 
 ### Hello World with ES6 and JSX
 
-We recommend using a bundler like [webpack](https://webpack.github.io/) or [Browserify](http://browserify.org/) so you can write modular code and bundle it together into small packages to optimize load time.
+We recommend using a bundler like [webpack](https://webpack.js.org/) or [Browserify](http://browserify.org/) so you can write modular code and bundle it together into small packages to optimize load time.
 
 The smallest React example looks like this: