minor #19809 [Security] make:security:custom (jrushlow)

This PR was merged into the 6.4 branch.

Discussion
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[Security] `make:security:custom`

Since MakerBundle `v1.59.0` - you can call `make:security:custom` to generate a simple, no-frills, custom authenticator based off the example in the docs.

- [x] Maker PR: symfony/maker-bundle#1522
- [ ] Maker Release: `v1.59.0` (Not yet released)

Commits
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6ae48a8 [security] `make:security:custom`

Author: javiereguiluz

security/custom_authenticator.rst

@@ -5,7 +5,8 @@ Symfony comes with :ref:`many authenticators <security-authenticators>` and
 third party bundles also implement more complex cases like JWT and oAuth
 2.0. However, sometimes you need to implement a custom authentication
 mechanism that doesn't exist yet or you need to customize one. In such
-cases, you must create and use your own authenticator.
+cases, you can use the ``make:security:custom`` command to create your own
+authenticator.
 
 Authenticators should implement the
 :class:`Symfony\\Component\\Security\\Http\\Authenticator\\AuthenticatorInterface`.