[#4651] Fixing build error

Author: weaverryan

contributing/code/security.rst

@@ -98,7 +98,7 @@ Security Advisories
 .. tip::
 
     You can check your Symfony application for known security vulnerabilities
-    using the ``security:check`` command. See :doc:`</book/security/checking-vulnerabilities>`
+    using the ``security:check`` command. See :ref:`<book-security-checking-vulnerabilities>`.
 
 This section indexes security vulnerabilities that were fixed in Symfony
 releases, starting from Symfony 1.0.0: