To avoid "SpacingAfterParams" error with PHPCS Symfony2 coding standard

Hello,
I added two blank lines in comments two avoid the following error with PHPCS Symfony2 coding standard :
Error Code: SpacingAfterParams
Error Description: Last parameter comment requires a blank new line after it.
Merge pull request #730 from NicolasN/patch-1

To avoid "SpacingAfterParams" error with PHPCS Symfony2 coding standard