fix(guides/hot-module-replacement): path.resolve

* Fix path.resolve() import error in example config.

Author: mhaagens

content/guides/hot-module-replacement.md

@@ -44,7 +44,7 @@ module.exports = {
 
   devServer: {
     hot: true, // Tell the dev-server we're using HMR
-    contentBase: resolve(__dirname, 'dist'),
+    contentBase: path.resolve(__dirname, 'dist'),
     publicPath: '/'
   }
 };