Merge branch '6.4' into 7.2

* 6.4:
  Reword
  [Security]: Removing duplicate sentence

Author: javiereguiluz

security.rst

@@ -622,13 +622,10 @@ don't accidentally block Symfony's dev tools - which live under URLs like
 
     This feature is not supported by the XML configuration format.
 
-All *real* URLs are handled by the ``main`` firewall (no ``pattern`` key means
-it matches *all* URLs). A firewall can have many modes of authentication,
-in other words, it enables many ways to ask the question "Who are you?".
-
-Often, the user is unknown (i.e. not logged in) when they first visit your
-website. If you visit your homepage right now, you *will* have access and
-you'll see that you're visiting a page behind the firewall in the toolbar:
+A firewall can have many modes of authentication, in other words, it enables many
+ways to ask the question "Who are you?". Often, the user is unknown (i.e. not logged in)
+when they first visit your website. If you visit your homepage right now, you *will*
+have access and you'll see that you're visiting a page behind the firewall in the toolbar:
 
 .. image:: /_images/security/anonymous_wdt.png
    :alt: The Symfony profiler toolbar where the Security information shows "Authenticated: no" and "Firewall name: main"