minor #5363 Added description on how to enable the security:check command through… (bizmate)

This PR was merged into the 2.7 branch.

Discussion
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Added description on how to enable the security:check command through…

… composer

Commits
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f5774d2 Changed 'in' to 'to' and removed 'composer'
8f00174 Merge remote-tracking branch 'remotes/upstream/2.7' into 2.7
5c872f2 Bundle name case change
aa0dff4 Indented code block in security:check command description
5aa7044 Improved security:check command description
396302b Added description on how to enable the security:check command through composer

Author: weaverryan

book/security.rst

@@ -1378,6 +1378,15 @@ FriendsOfPHP organization.
     any of your dependencies is affected by a known security vulnerability.
     Therefore, you can easily integrate it in your build process.
 
+.. note::
+
+    To enable the ``security:check`` command, you need to add the
+    `SensioDistributionBundle`_ to your dependencies.
+
+    .. code-block:: bash
+
+        $ composer require 'sensio/distribution-bundle'
+
 Final Words
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@@ -1408,3 +1417,4 @@ Learn More from the Cookbook
 .. _`frameworkextrabundle documentation`: https://symfony.com/doc/current/bundles/SensioFrameworkExtraBundle/index.html
 .. _`security advisories database`: https://github.com/FriendsOfPHP/security-advisories
 .. _`HWIOAuthBundle`: https://github.com/hwi/HWIOAuthBundle
+.. _`SensioDistributionBundle`: https://packagist.org/packages/sensio/distribution-bundle