Fix webpack-dev-server iframe link

tutorials/getting-started/1.9 development-server/README.md

@@ -10,6 +10,6 @@ npm install webpack-dev-server -g
 webpack-dev-server --progress --colors
 ```
 
-This binds a small express server on localhost:8080 which serves your static assets as well as the bundle (compiled automatically). It automatically updates the browser page when a bundle is recompiled (socket.io). Open [http://localhost:8080/webpack-dev-server/bundle](http://localhost:8080/webpack-dev-server/bundle) in your browser.
+This binds a small express server on localhost:8080 which serves your static assets as well as the bundle (compiled automatically). It automatically updates the browser page when a bundle is recompiled (socket.io). Open [http://localhost:8080/webpack-dev-server/](http://localhost:8080/webpack-dev-server/) in your browser.
 
 > The dev server uses webpack's watch mode. It also prevents webpack from emitting the resulting files to disk. Instead it keeps and serves the resulting files from memory.