Update example comment to remove unnecessary text

Author: pierredup

frontend/encore/simple-example.rst

@@ -22,7 +22,7 @@ Inside, use Encore to help generate your Webpack configuration.
     var Encore = require('@symfony/webpack-encore');
 
     Encore
-        // directory where should all compiled assets will be stored
+        // directory where all compiled assets will be stored
         .setOutputPath('web/build/')
 
         // what's the public path to this directory (relative to your project's document root dir)