changed the PSR-0 document URL to a more canonical one

Author: fabpot

components/class_loader.rst

@@ -122,5 +122,5 @@ or one of its children, the autoloader will first look for the class under the
 ``Doctrine`` directory (the last one configured) if not found, before giving up.
 The order of the registrations is significant in this case.
 
-.. _standards: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
+.. _standards: http://symfony.com/PSR0
 .. _PEAR:      http://pear.php.net/manual/en/standards.php

cookbook/bundles/best_practices.rst

@@ -283,4 +283,4 @@ Learn more from the Cookbook
 
 * :doc:`/cookbook/bundles/extension`
 
-.. _standards: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
+.. _standards: http://symfony.com/PSR0

quick_tour/the_architecture.rst

@@ -362,5 +362,5 @@ need to learn a lot to become a Symfony2 master. Ready to dig into these
 topics now? Look no further - go to the official :doc:`/book/index` and pick
 any topic you want.
 
-.. _standards:               https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md
-.. _convention:              http://pear.php.net/
+.. _standards:  http://symfony.com/PSR0
+.. _convention: http://pear.php.net/