minor #6308 fix literal syntax (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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fix literal syntax

Commits
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d2b2c29 fix literal syntax

Author: xabbuh

cookbook/security/form_login_setup.rst

@@ -303,7 +303,7 @@ When setting up your login form, watch out for a few common pitfalls.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 First, be sure that you've defined the ``/login`` route correctly and that
-it corresponds to the ``login_path`` and``check_path`` config values.
+it corresponds to the ``login_path`` and ``check_path`` config values.
 A misconfiguration here can mean that you're redirected to a 404 page instead
 of the login page, or that submitting the login form does nothing (you just see
 the login form over and over again).