minor symfony#6082 change app/check.php for 3.0 (nanocom)

This PR was merged into the 3.0 branch.

Discussion
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change app/check.php for 3.0

Commits
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1f5ee01 change app/check.php for 3.0

Author: xabbuh

cookbook/deployment/tools.rst

@@ -111,7 +111,7 @@ Check if your server meets the requirements by running:
 
 .. code-block:: bash
 
-    $ php app/check.php
+    $ php bin/symfony_requirements
 
 B) Configure your ``app/config/parameters.yml`` File
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~