docs(webpack): fix a typo in the dev guide

closes #1431

Author: ramzysa

public/docs/ts/latest/guide/webpack.jade

@@ -303,7 +303,7 @@ a(id="development-configuration")
   The `HtmlWebpackPlugin` (added in `webpack.common.js`) use the *publicPath* and the *filename* settings to generate 
   appropriate <script> and <link> tags into the `index.html`.
 
-  Our CSS are buried inside our Javascript bundles by deault. The `ExtractTextPlugin` extracts them into
+  Our CSS are buried inside our Javascript bundles by default. The `ExtractTextPlugin` extracts them into
   external `.css` files that the `HtmlWebpackPlugin` inscribes as <link> tags into the `index.html`.
 
   Refer to the Webpack documentation for details on these and other configuation options in this file