minor #8941 Added tip to enable CsrfTokenManager as service (jonasarts, javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
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Added tip to enable CsrfTokenManager as service

in the framework configuration file as it is required for autowiring on the ExampleFormAuthenticator constructor

Commits
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21d42f3 Reword
9ae3f82 Added tip to enable CsrfTokenManager as service

Author: javiereguiluz

security/guard_authentication.rst

@@ -484,7 +484,8 @@ Adding CSRF Protection
 If you're using a Guard authenticator to build a login form and want to add CSRF
 protection, no problem!
 
-First, :ref:`add the _csrf_token to your login template <csrf-login-template>`.
+First, check that :ref:`the csrf_protection option <reference-framework-csrf-protection>`
+is enabled and :ref:`add the _csrf_token field to your login form <csrf-login-template>`.
 
 Then, type-hint ``CsrfTokenManagerInterface`` in your ``__construct()`` method
 (or manually configure the ``Symfony\Component\Security\Csrf\CsrfTokenManagerInterface``