minor #6940 Minor rewording for the security:checker article (javiereguiluz)

This PR was submitted for the 2.8 branch but it was merged into the 2.7 branch instead (closes #6940).

Discussion
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Minor rewording for the security:checker article

Installing the bundle is not enough ... you must enable it also.

Commits
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84fabcc Minor rewording for the security:checker article

Author: xabbuh

security/security_checker.rst

@@ -27,11 +27,7 @@ FriendsOfPHP organization.
 .. note::
 
     To enable the ``security:check`` command, make sure the
-    `SensioDistributionBundle`_ is installed.
-
-    .. code-block:: terminal
-
-        $ composer require 'sensio/distribution-bundle'
+    `SensioDistributionBundle`_ is installed and enabled in your application.
 
 .. _`security advisories database`: https://github.com/FriendsOfPHP/security-advisories
-.. _`SensioDistributionBundle`: https://packagist.org/packages/sensio/distribution-bundle
+.. _`SensioDistributionBundle`: https://github.com/sensiolabs/SensioDistributionBundle