Link to webpack 2 docs (#1097)

Author: simon04

docs/en/hot-reload.md

@@ -1,6 +1,6 @@
 # Hot Reloading
 
-Vuex supports hot-reloading mutations, modules, actions and getters during development, using webpack's [Hot Module Replacement API](https://webpack.github.io/docs/hot-module-replacement.html). You can also use it in Browserify with the [browserify-hmr](https://github.com/AgentME/browserify-hmr/) plugin.
+Vuex supports hot-reloading mutations, modules, actions and getters during development, using webpack's [Hot Module Replacement API](https://webpack.js.org/guides/hot-module-replacement/). You can also use it in Browserify with the [browserify-hmr](https://github.com/AgentME/browserify-hmr/) plugin.
 
 For mutations and modules, you need to use the `store.hotUpdate()` API method:
 

docs/en/plugins.md

@@ -81,7 +81,7 @@ const store = new Vuex.Store({
 })
 ```
 
-The plugin will be used by default. For production, you will need [DefinePlugin](https://webpack.github.io/docs/list-of-plugins.html#defineplugin) for webpack or [envify](https://github.com/hughsk/envify) for Browserify to convert the value of `process.env.NODE_ENV !== 'production'` to `false` for the final build.
+The plugin will be used by default. For production, you will need [DefinePlugin](https://webpack.js.org/plugins/define-plugin/) for webpack or [envify](https://github.com/hughsk/envify) for Browserify to convert the value of `process.env.NODE_ENV !== 'production'` to `false` for the final build.
 
 ### Built-in Logger Plugin