Merge pull request symfony#568 from tobiassjosten/master

Added commenting to a comment

Author: weaverryan

book/doctrine.rst

@@ -949,7 +949,7 @@ to the given ``Category`` object via their ``category_id`` value.
 
  $category = $product->getCategory();
 
- prints "Proxies\AcmeStoreBundleEntityCategoryProxy"
+ // prints "Proxies\AcmeStoreBundleEntityCategoryProxy"
  echo get_class($category);
 
  This proxy object extends the true ``Category`` object, and looks and