minor #19177 [Security] Explicit check route option for loginlink usage (MrYamous)

This PR was merged into the 5.4 branch.

Discussion
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[Security] Explicit check route option for loginlink usage

After struggling with this option for a while when i tried to use route path as value for `check_route` option i suggest to explicitly say in documentation a route name is expected with this option

Commits
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701d402 explicit check route option for loginlink usage

Author: javiereguiluz

security/login_link.rst

@@ -28,8 +28,8 @@ this is not yet the case.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The login link authenticator is configured using the ``login_link`` option
-under the firewall. You must configure a ``check_route`` and
-``signature_properties`` when enabling this authenticator:
+under the firewall. You must configure a ``check_route`` with a route name
+and ``signature_properties`` when enabling this authenticator:
 
 .. configuration-block::