minor #38802 [Security] Remove dead references to AnonymousAuthenticator (chalasr)

This PR was merged into the 5.1 branch.

Discussion
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[Security] Remove dead references to AnonymousAuthenticator

| Q             | A
| ------------- | ---
| Branch?       | 5.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
-------

9376e8778d [Security] Remove dead references to AnonymousAuthenticator

src/Symfony/Component/Security/Http/Authentication/AuthenticatorManager.php

@@ -129,8 +129,7 @@ class AuthenticatorManager implements AuthenticatorManagerInterface, UserAuthent
         foreach ($authenticators as $authenticator) {
             // recheck if the authenticator still supports the listener. supports() is called
             // eagerly (before token storage is initialized), whereas authenticate() is called
-            // lazily (after initialization). This is important for e.g. the AnonymousAuthenticator
-            // as its support is relying on the (initialized) token in the TokenStorage.
+            // lazily (after initialization).
             if (false === $authenticator->supports($request)) {
                 if (null !== $this->logger) {
                     $this->logger->debug('Skipping the "{authenticator}" authenticator as it did not support the request.', ['authenticator' => \get_class($authenticator)]);

src/Symfony/Component/Security/Http/Tests/Authentication/AuthenticatorManagerTest.php

@@ -71,7 +71,7 @@ class AuthenticatorManagerTest extends TestCase
     {
         // the attribute stores the supported authenticators, returning false now
         // means support changed between calling supports() and authenticateRequest()
-        // (which is the case with lazy firewalls and e.g. the AnonymousAuthenticator)
+        // (which is the case with lazy firewalls)
         $authenticator = $this->createAuthenticator(false);
         $this->request->attributes->set('_security_authenticators', [$authenticator]);