Avoid returning objects passed by reference.

Objects are always passed by reference, so it doesn't make sense to
return an object which is passed by reference as it will always be the
same object. This change makes the code a bit more readable.

src/Wallabag/CoreBundle/Helper/ContentProxy.php

@@ -40,8 +40,6 @@ class ContentProxy
      * @param Entry  $entry   Entry to update
      * @param string $url     Url to grab content for
      * @param array  $content An array with AT LEAST keys title, html, url to skip the fetchContent from the url
-     *
-     * @return Entry
      */
     public function updateEntry(Entry $entry, $url, array $content = [])
     {
@@ -130,8 +128,6 @@ class ContentProxy
                 'error_msg' => $e->getMessage(),
             ]);
         }
-
-        return $entry;
     }
 
     /**