minor #17676 [Security] Remember me JSON Login (baumerdev)

This PR was merged into the 6.3 branch.

Discussion
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[Security] Remember me JSON Login

Add block with description, how to set up remember me functionality for JSON Login

Issue symfony/symfony#40918
Pull Request symfony/symfony#48899

Commits
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4397755 Add JSON login remember me symfony/symfony#48899

Author: javiereguiluz

security/remember_me.rst

@@ -108,6 +108,9 @@ Using the remember me cookie is not always appropriate (e.g. you should not
 use it on a shared PC). This is why by default, Symfony requires your users
 to opt-in to the remember me system via a request parameter.
 
+Remember Me for Form Login
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
 This request parameter is often set via a checkbox in the login form. This
 checkbox must have a name of ``_remember_me``:
 
@@ -130,6 +133,25 @@ checkbox must have a name of ``_remember_me``:
     Optionally, you can configure a custom name for this checkbox using the
     ``name`` setting under the ``remember_me`` section.
 
+Remember Me for JSON Login
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+If you implement the login via an API that uses :ref:`JSON Login <json-login>`
+you can add a ``_remember_me`` key to the body of your POST request.
+
+.. code-block:: json
+
+    {
+        "username": "[email protected]",
+        "password": "MyPassword",
+        "_remember_me": true
+    }
+
+.. note::
+
+    Optionally, you can configure a custom name for this key using the
+    ``name`` setting under the ``remember_me`` section.
+
 Always activating Remember Me
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~